Luminescence
Articles tagged with Luminescence
Simple synthetic strategy converts blue-emissive molecules into multicolor luminescent materials
Researchers create molecular crystal with reversible color changes spanning from green to orange-red upon mechanical stress or pressure. The material exhibits adaptive intermolecular interactions and structural flexibility, enabling stimulus-responsive luminescence.
Fish "steals" glowing protein: genome sequencing proves unique survival strategy
Researchers confirm Parapriacanthus ransonneti lacks luciferase gene, instead relies on ingested proteins to produce bioluminescence. This unique adaptation represents a form of kleptoproteinism with potential applications in drug delivery systems.
Mo4+ and Ag+ co-sensitized double perovskites enable ultra-broadband NIR emission
Researchers developed a synergistic strategy using Mo4+ and Ag+ ions in lanthanide-doped double perovskites, enhancing photon absorption and radiative recombination. This leads to ultra-broad NIR emission over 250-850 nm with high luminescence efficiency.
Seeing the unseen: Scientists demonstrate dual-mode color generation from invisible light
Researchers develop a rigid organic crystal that emits red light under UV irradiation through excimer formation and generates green light through second harmonic generation under near-infrared exposure. The dual-mode optical behavior operates independently within the same crystal without interference.
Novel large-scale, eco-friendly perovskite ink paves the way for advanced optical technologies
Researchers developed a scalable, eco-friendly method to produce chiral perovskite nanocrystal/ethyl cellulose ink with exceptional stability and processability. The new ink enables the fabrication of flexible, high-performance circularly polarized luminescent films and patterns.
Tuning color through molecular stacking: A new strategy for smarter pressure sensors
Researchers have developed a new way to produce fluorescence by using molecular stacking, which can lead to the creation of smarter and more sensitive pressure sensors. The study focused on two crystalline organoboron compounds that exhibit piezofluorochromism, changing color in response to pressure.
Bulk inorganic crystals grown from water emit “handed” light
Researchers at Kumamoto University have successfully grown a bulk inorganic crystal from water that emits circularly polarized light. This breakthrough material has the potential to revolutionize security printing, advanced displays, and photonic technologies with simple inorganic chemistry.
Triboluminescence of metal halide perovskite films
Researchers discovered that MHP films exhibit triboluminescence when scraped with metals like copper, gold, or platinum, due to friction-induced charge transfer. This phenomenon is universally observed across commonly studied MHP films. The enhancement of PL is attributed to the accumulation of positive charges on the perovskite surfac...
Over a decade in the making: Illuminating new possibilities with lanthanide nanocrystals
Scientists at NUS and partner universities demonstrated highly efficient electroluminescence from lanthanide nanocrystals, marking an unprecedented level of control over exciton dynamics. The breakthrough enables devices to shift their color output across the visible to near-infrared spectrum with great efficiency.
Crystal-free mechanoluminescence illuminates new possibilities for next-generation materials
Scientists at OIST have created crystal-free films of photoluminescent compounds that exhibit mechanoluminescence when stimulated through mechanical forces. This breakthrough removes the need for complex crystal design and engineering in creating mechanoluminescent materials.
Efficient deep-blue LEDs based on colloidal CsPbBr3 nanoplatelets meeting the Rec.2020 standard
Researchers developed efficient deep-blue light-emitting diodes (PeLEDs) using colloidal CsPbBr3 nanoplatelets, achieving record-breaking performance with a maximum external quantum efficiency of 6.81%. The devices also exhibit stable deep-blue emission and precise color coordinates that fully satisfy the stringent Rec.2020 requirement.
Extra silver atom sparks breakthrough in photoluminescence of silver nanoclusters
Researchers at Tohoku University unveiled a 77-fold increase in photoluminescence quantum yield by adding a single silver atom to high-nuclear Ag nanoclusters. This discovery paves the way for practical applications in optoelectronics and sensing technologies.
Luminescence characteristics of Eu-doped CaF₂ crystals vary with radiation type
Researchers investigated the luminescence characteristics of Eu-doped CaF₂ crystals under alpha and X-ray irradiation. They found that the ratio of Eu²⁺-induced emission to Eu³⁺-induced emission varies depending on the radiation type, with differences in light color potentially used to identify radiation types.
Recyclable luminescent solar concentrator from lead-free perovskite derivative
Scientists have developed a recyclable luminescent solar concentrator (LSC) using a lead-free perovskite derivative, which absorbs sunlight and emits fluorescence to generate electricity. The LSC exhibits high power conversion and optical efficiencies, as well as self-healing and reversible transition properties.
Ultralong organic afterglow from small molecular host-guest materials: State of the art
Researchers review host-guest type organic ultra-long afterglow materials with focus on selection principles, efficiency improvement and photophysical properties. They highlight the unique long-lived excited state properties of these materials.
Making the invisible visible: a new way to boost light emission at the nanoscale
Researchers discovered a new way to enhance light emission in nanoparticles, leading to the visualization of infrared radiation. The technique, which involves simultaneous excitation with two near-infrared beams, could have applications in microscopy and photonic technologies.
Artificial biosensor can better measure the body’s main stress hormone
A new artificial biosensor developed by University of California, Santa Cruz's Andy Yeh can accurately measure cortisol levels across all relevant ranges for human health. The sensor uses a smartphone camera to detect light emissions, providing high sensitivity and dynamic range for detecting small molecule analytes.
Scientists pioneer 3D temperature mapping inside living tissue using light and AI
Researchers have developed a groundbreaking technique that maps temperature in three dimensions within biological tissue using invisible light and artificial intelligence. This new technology has the potential to improve early disease detection and treatment monitoring without the need for costly or invasive imaging technologies.
World’s first: Lithuanian scientists’ discovery may transform OLED technology and explosives detection
Researchers have observed the luminescence of an excited complex formed by two donor molecules, opening possibilities for developing simpler, more efficient OLED devices. The discovery also enables the creation of sensitive sensors capable of detecting low concentrations of explosive substances.
Tracing the origin of near-infrared emissions emanating from manganese (II)
The study reveals that manganese exists in a divalent (+2) state in the YAG structure, emitting near-infrared light. The fluorescence lifetime of the red emission is shorter than the NIR emission, suggesting distinct lattice site occupation.
Scientists create a ‘brilliantly luminous’ nanoscale chemical tool
Researchers developed fluorescent polyionic nanoclays that can be customized for medical imaging, sensor technology, and environmental protection. These tiny clay-based materials exhibit high brightness and versatility, enabling precise tuning of optical properties.
With new database researchers may be able to predict rare milky seas bioluminescent, glowing event
A new database of 400 years of sightings compiled by researchers at Colorado State University may help anticipate when and where milky seas will occur. The archive includes eyewitness reports, satellite data, and individual accounts submitted to the Marine Observer Journal.
Controlling electrons in molecules at ultrafast timescales
Scientists have found a way to control electrons in molecules using tailored terahertz light pulses, potentially leading to advances in electronics, energy transfer, and chemical reactions. This new method allows for precise control of molecular states essential for processes like solar cells and LEDs.
Designing molecules that produce color-changing circular light for 3D displays and security printing
Scientists develop mechanochromic luminescence using chiral pyrenylprolinamides, a significant step towards widespread implementation of materials with switchable solid-state CPL. The findings provide new design guidelines for creating molecules that enable solid-state CPL switching through mechanical stimuli.
Shaping future of displays: clay/europium-based technology offers dual-mode versatility
The study introduces a game-changing concept in dual-mode display design by uniting luminescence and coloration within a single device. The device leverages smectite clay to stabilize europium(III) complexes for vibrant luminescence and heptyl viologen derivatives for striking color changes.
Scientists develop “Malteser-like” molecules with potential applications in targeted drug delivery
Researchers from Trinity College Dublin have developed 'Malteser-like' molecules that can be governed to produce predictable and desirable self-assembly structures. These molecules hold promise for applications in highly sensitive sensors, next-gen targeted drug delivery agents, and luminescence-based monitoring.
Refining hardwood by bioluminescence
Scientists at the Swiss Federal Laboratories for Materials Science and Technology have successfully created luminous wood by combining fungal threads with hardwood. The process involves a two-stage enzymatic reaction that stimulates the production of luciferin, emitting green light from the treated wood.
Location of the world’s oldest ochre mine detected
An international team of researchers has confirmed the location of the oldest ochre mine in the world, dating back around 48,000 years. Ochre was found to have spread from the mine to nearby areas, revealing ancient extraction and transport networks.
New method for measuring luminescence lifetime offers breakthrough in scientific imaging
A new integrated method simplifies luminescence lifetime measurements, allowing researchers to determine lifetimes using standard camera systems. This breakthrough technique transforms fields that rely on optical sensing and chemical imaging.
Multicolor persistent luminescent materials for dynamic optical anti-counterfeiting
A non-stoichiometric material exhibits color change in response to different ultraviolet light stimuli, demonstrating excitation-wavelength-dependent emission properties. The material can display multicolor afterglow patterns, enabling the development of a new information read-write mode.
SNU researchers develop ultra-high efficiency next-generation perovskite light-emitting diodes by strengthening perovskite lattice
Researchers at Seoul National University developed ultra-high efficiency perovskite nanocrystal LEDs by incorporating conjugated molecular multipods to strengthen the lattice and reduce dynamic disorder, leading to improved luminescence efficiency. This achievement is expected to significantly accelerate the commercialization of next-g...
Electrical stimulation for brighter persistent luminescence
Researchers create a new yellow-green luminescent material to address growing industrial demand for brighter afterglow. They successfully apply an electric field stimulation method, increasing the initial luminance of the SrAl2O4:Eu2+,Dy3+ phosphor and demonstrating its potential for high brightness long afterglow emission.
Novel method enhances size-controlled production of luminescent quantum dots
Researchers at the University of São Paulo developed a novel approach to monitoring quantum dot formation, enabling real-time control over nanoparticle growth and precise emission color. This technique has several advantages over conventional synthesis strategies, including reduced waste and improved equipment efficiency.
Quantum dots and metasurfaces: Deep connections in the nano world
Researchers at Pohang University of Science & Technology have created metasurfaces embedded with quantum dots, enhancing their luminescence efficiency. The study achieved up to 25 times greater luminescence efficiency compared to a simple coating of quantum dots.
Keeping the lights on
A study published in Applied Physics Letters reveals that decreasing carbon concentration can increase the amount of light emitted from GaN crystals. The researchers found a threshold concentration above which carbon atoms become a significant factor in dissipating energy, leading to improved internal quantum efficiency.
Synthesizing π-extended carbohelicene-based circularly polarized luminescence emitters
Researchers at Tokyo Institute of Technology developed a new strategy to synthesize 3D π-extended carbohelicenes, overcoming molecular distortions and achieving CPL brightness of up to 513 M–1 cm–1. The study provides a solid groundwork for further research and development of high-performance carbohelicenes.
New colorful plastic films for versatile sensors and electronic displays
Scientists from Osaka University create borane molecules that exhibit red-shifted light emission upon binding to fluoride, enabling versatile materials for electronic display and chemical sensing applications. The researchers also achieve fine-tuning of the color of light emission by adjusting the quantity of added fluoride.
USTC researchers develop a new strategy to enhance blue perovskite led performance
Researchers from USTC and University of Cambridge devised a novel strategy to boost blue perovskite LED efficiency by controlling perovskite phase distribution, defect states, and ion migration. This approach resulted in high-efficiency and stable blue LEDs with a peak external quantum efficiency of 21.4%.
Scientists develop biocompatible fluorescent spray that detects fingerprints in ten seconds
Researchers have created a water-soluble fluorescent spray that can visualize latent fingerprints in just ten seconds. The new dye-based technology is non-toxic, biologically compatible, and reduces the risk of damaging DNA evidence.
All in NaY(WO4)₂:Er³⁺/Yb³⁺: Quantum cutting, upconversion, and temperature sensing
Researchers developed highly efficient photo split, near-infrared upconversion emission and suitable temperature sensing for thermal management in silicon-based solar cells by adjusting Er³⁺/Yb³⁺ doping concentrations in NaY(WO₄)₂ phosphor. An efficiency of up to 173% was achieved.
Let it glow: Scientists develop new approach to detect ‘forever chemicals’ in water
Researchers have created a prototype model that detects 'forever chemicals' in water using a luminescent metal complex attached to a sensor surface. The approach can detect 220 micrograms of PFAS per liter of water, but needs to be more sensitive to detect nanogram levels for drinking water.
Multi-point temperature measurements in packed beds using phosphor thermometry and ray tracing simulations
Researchers propose an indirect optical method for determining internal temperatures of opaque packed beds based on phosphor thermometry. Ray tracing simulations enable simultaneous multi-point measurements, allowing for accurate full temperature distribution within the bed.
A highly efficient open-shell singlet luminescent diradical with strong magnetoluminescence properties
A new type of luminescent diradical has been created, showing high photoluminescence and photo-stability. The material demonstrates significant single-molecule magnetoluminescence properties, achieving a giant ML value of 210% at a magnetic field of 7 T.
Printable circularly polarized luminescence materials enables flexible, stereoscopic displaying
Researchers have developed printable circularly polarized luminescence materials that enable flexible 3D imaging. The materials exhibit intense circularly polarized emission and can be used to create large-scale, high-performance integral imaging displays.
Archaeologists discover world’s oldest wooden structure
The discovery of well-preserved wood at Kalambo Falls in Zambia reveals that humans were building structures made of wood at least 476,000 years ago. This finding challenges the long-held assumption that Stone Age humans were nomadic, as they had access to a perennial source of water and food in the forest.
Making the invisible, visible: New method makes mid-infrared light detectable at room temperature
Scientists developed a new method for detecting mid-infrared (MIR) light at room temperature using quantum systems. The MIR Vibrationally-Assisted Luminescence (MIRVAL) approach converts low-energy MIR photons into high-energy visible photons, enabling single-molecule spectroscopy and detection.
Intervalence charge transfer of Cr³⁺-Cr³⁺ aggregation for NIR-Ⅱ luminescence
The team achieves NIR-Ⅱ broadband luminescence via intervalence charge transfer in LaMgGa₁₁O₁₉, exhibiting dual-emission (NIR-I and NIR-II) with high efficiency and luminescence external efficiency of 18.9%. The luminescence shows anti-thermal quenching behavior and longer decay lifetime associated with the anomalous NIR-II emission.
Coastal lights trick coral reefs into spawning earlier than they should
A new study found that coastal light pollution causes corals to spawn one to three days closer to the full moon, reducing the likelihood of fertilized eggs surviving and producing new adult corals. This disrupts the natural spawning cycle, which is critical for reef recovery after mass bleaching events.
Hackmanite changes color also upon exposure to nuclear radiation – memory trace from radiation enables new applications
Researchers at the University of Turku discovered that hackmanite changes color when exposed to nuclear radiation, retaining a memory trace that allows it to be reused. This unique property enables the development of reusable radiochromic films for measuring radiation doses and mapping dose distribution.
Linked lanthanides shine light on field of crystal engineering
Scientists have connected two soft crystals and observed energy transfer between them, leading to the potential development of sophisticated materials. The study used rare earth metals called lanthanides, which can luminesce, to create a molecular train that exhibited green luminescence at one end and yellow luminescence at the other.
Building molecular bridges: New crystal engineering strategy to design ultrabright fluorescent solid dyes
A new study from Tokyo Institute of Technology introduces a novel crystal engineering strategy to design ultrabright fluorescent solid dyes. This approach allows for monomeric emission and suppressed intermolecular interactions, enabling the creation of highly dense crystalline structures with controlled electronic properties.
Huddersfield researchers secure funding to illuminate chemistry
Huddersfield researchers are working on a new project to develop novel and sustainable molecular materials that harness light to drive useful chemical reactions. The project aims to address the limitation of using rare and expensive elements like ruthenium and iridium in current applications. By exploring the intrinsic properties of li...
Nanodiamonds are a cell's best friend
Researchers at Kyoto University have developed the smallest nanodiamonds capable of detecting temperatures on the nanoscale inside cells and organelles. These nanodiamonds utilize silicon-vacancy color centers to gauge luminescence, enabling precise temperature sensing with sub-kelvin accuracy.
Trinity scientists create luminescent gels with multitude of applications from counterfeiting to bio-sensing
Researchers have developed luminescent gels inspired by nature, offering potential applications in bank note counterfeiting and next-gen bio-sensing. The gels utilize lanthanide ions for unique properties, including self-healing and variable emission intensities.
Electron-phonon coupling assisted universal red luminescence of o-phenylenediamine-based CDs
Researchers investigate the formation process and fluorescence mechanism of o-phenylenediamine-based red emission CDs. The study reveals a systematic approach to analyzing emission mechanisms, providing insights into the structure-property relationship of carbon dots.
Highly efficient Fe³⁺-doped A₂BB’O₆ broadband near-infrared-emitting phosphors for spectroscopic analysis
Researchers have developed Fe³⁺-activated Sr₂InSbO₆ broadband NIR-emitting phosphor materials with tunable emission from 885 to 1005 nm. The Ca2InSbO6:Fe3+ phosphor peaking at 935 nm shows an ultra-high IQE of 87%, making it suitable for NIR spectroscopy detection.
Hour-level of robust organic long persistent luminescence from carbon dots
A new carbon dots-based organic blend, m-CDs@CA, was developed to exhibit superior long persistent luminescence (LPL) features. The afterglow is observed for over one hour via irradiation by a hand-hold UV lamp, making it suitable for applications under ambient conditions and in aqueous medium.
Organic aggregates: new insights on white light
Research reveals organic aggregates can emit polychromic and white light with high efficiency, opening up new avenues for OLEDs and encryption. However, more work is needed to fully understand the underlying mechanisms and improve performance.
Wide-range luminescent thermometers? – Quite a challenge!
Researchers have created a wide-range luminescent thermometer using Pr3+ and YAl3(BO3)4:Pr3+,Gd3+, which offers high precision and low uncertainty in temperature measurement. This thermometer can measure temperatures between 30 K and 800 K with constant relative measurement uncertainty.