Phosphors and Fluorescent Converters in Light Sources with Blue LED Crystals

2018 ◽  
pp. 105-112 ◽  
Author(s):  
Victoriya A. Lapina ◽  
Peter P. Pershukevich ◽  
Alexei V. Trofimov ◽  
Natalya N. Trofimova ◽  
Yuri B. Tsaplev
Keyword(s):  
Quantum Dots ◽  
Organic Compounds ◽  
White Light ◽  
Coordination Compounds ◽  
Ultra Violet ◽  
Light Sources ◽  
Blue Led ◽  
Fluorescent Material ◽  
Metal Organic ◽  
Complex Coordination

The article presents a review of fluorescent material use: inorganic phosphors, organic polymeric and molecular phosphors, complex (coordination) compounds, quantum dots and frame metal-organic compounds as component materials of fluorescent converters to transform radiation of blue and ultra-violet diode crystals to white light.

LED Light Sources in Organic Synthesis: An Entry to A Novel Approach

2021 ◽  
Vol 18 ◽  
Author(s):  
Aparna Das
Keyword(s):  
Organic Compounds ◽  
Organic Synthesis ◽  
Photochemical Reaction ◽  
Low Cost ◽  
Environmentally Friendly ◽  
Photochemical Reactions ◽  
Light Sources ◽  
Blue Led ◽  
Oxidation Reduction ◽  
Novel Approach

: In recent years, photocatalytic technology has shown great potential as a low-cost, environmentally friendly, and sustainable technology. Compared to other light sources in photochemical reaction, LEDs have advantages in terms of efficiency, power, compatibility, and environmentally-friendly nature. This review highlights the most recent advances in LED-induced photochemical reactions. The effect of white and blue LEDs in reactions such as oxidation, reduction, cycloaddition, isomerization, and sensitization is discussed in detail. No other reviews have been published on the importance of white and blue LED sources in the photocatalysis of organic compounds. Considering all the facts, this review is highly significant and timely.

Synthesis and Structure Design of I-III-VI Quantum Dots for White Light-emitting Diodes

2022 ◽  
Author(s):  
Hanxu Lu ◽  
Zhe Hu ◽  
WenJie Zhou ◽  
JinXin Wei ◽  
Wanlu Zhang ◽  
...  
Keyword(s):  
Thermal Stability ◽  
Quantum Dots ◽  
White Light ◽  
Light Emitting Diodes ◽  
Structure Design ◽  
Light Sources ◽  
Light Emitting ◽  
The Past ◽  
Wavelength Tunability ◽  
White Light Emitting Diodes

Quantum-dot-based light-emitting diodes (LEDs) have been considered as promising alternatives to the traditional light sources due to their photo- and thermal-stability, emission wavelength tunability, and so forth. From the past...

Synthesis of graphene quantum dot/metal–organic framework nanocomposites as yellow phosphors for white light-emitting diodes

2018 ◽  
Vol 42 (7) ◽  
pp. 5083-5089 ◽  
Author(s):  
Dengyu Pan ◽  
Lijun Wang ◽  
Zhen Li ◽  
Bijiang Geng ◽  
Chen Zhang ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Fluorescence Quenching ◽  
White Light ◽  
Metal Organic Framework ◽  
Graphene Quantum Dots ◽  
Light Emitting ◽  
Graphene Quantum Dot ◽  
Metal Organic ◽  
White Light Emitting Diodes ◽  
Organic Framework

Graphene quantum dots (GQDs) and a metal–organic framework were assembled to form a nanocomposite for solving the GQDs’ fluorescence quenching problem in WLEDs.

scholarly journals Temperature-Dependent Luminescence of Red-Emitting Ba2Y5B5O17: Eu3+ Phosphors with Efficiencies Close to Unity for Near-UV LEDs

Materials ◽  
2020 ◽  
Vol 13 (3) ◽  
pp. 763 ◽  
Author(s):  
Egle Ezerskyte ◽  
Julija Grigorjevaite ◽  
Agne Minderyte ◽  
Sebastien Saitzek ◽  
Arturas Katelnikovas
Keyword(s):  
Optical Properties ◽  
Solid State ◽  
White Light ◽  
Light Sources ◽  
Phosphor Powder ◽  
Temperature Dependent ◽  
Blue Led ◽  
Uv Led ◽  
Uv Leds

Solid state white light sources based on a near-UV LED chip are gaining more and more attention. This is due to the increasing efficiency of near-UV-emitting LED chips and wider phosphors selection if compared to devices based on blue LED chips. Here, a brief overview is given of the concepts of generating white light employing near-UV LED and some optical properties of the available phosphors are discussed. Finally, the synthesis and optical properties of very efficient red-emitting Ba2Y5B5O17:Eu3+ phosphor powder and ceramics is reported and discussed in terms of possible application as a red component in near-UV LED-based white light sources.

scholarly journals Volatile Organic Compound Vapour Measurements Using a Localised Surface Plasmon Resonance Optical Fibre Sensor Decorated with a Metal-Organic Framework

Sensors ◽  
2021 ◽  
Vol 21 (4) ◽  
pp. 1420
Author(s):  
Chenyang He ◽  
Liangliang Liu ◽  
Sergiy Korposh ◽  
Ricardo Correia ◽  
Stephen P. Morgan
Keyword(s):  
Surface Plasmon Resonance ◽  
Volatile Organic Compounds ◽  
Organic Compounds ◽  
Surface Plasmon ◽  
Optical Fibre ◽  
Plasmon Resonance ◽  
Metal Organic Framework ◽  
Volatile Organic ◽  
Metal Organic ◽  
Organic Framework

A tip-based fibreoptic localised surface plasmon resonance (LSPR) sensor is reported for the sensing of volatile organic compounds (VOCs). The sensor is developed by coating the tip of a multi-mode optical fibre with gold nanoparticles (size: 40 nm) via a chemisorption process and further functionalisation with the HKUST-1 metal–organic framework (MOF) via a layer-by-layer process. Sensors coated with different cycles of MOFs (40, 80 and 120) corresponding to different crystallisation processes are reported. There is no measurable response to all tested volatile organic compounds (acetone, ethanol and methanol) in the sensor with 40 coating cycles. However, sensors with 80 and 120 coating cycles show a significant redshift of resonance wavelength (up to ~9 nm) to all tested volatile organic compounds as a result of an increase in the local refractive index induced by VOC capture into the HKUST-1 thin film. Sensors gradually saturate as VOC concentration increases (up to 3.41%, 4.30% and 6.18% in acetone, ethanol and methanol measurement, respectively) and show a fully reversible response when the concentration decreases. The sensor with the thickest film exhibits slightly higher sensitivity than the sensor with a thinner film. The sensitivity of the 120-cycle-coated MOF sensor is 13.7 nm/% (R2 = 0.951) with a limit of detection (LoD) of 0.005% in the measurement of acetone, 15.5 nm/% (R2 = 0.996) with an LoD of 0.003% in the measurement of ethanol and 6.7 nm/% (R2 = 0.998) with an LoD of 0.011% in the measurement of methanol. The response and recovery times were calculated as 9.35 and 3.85 min for acetone; 5.35 and 2.12 min for ethanol; and 2.39 and 1.44 min for methanol. The humidity and temperature crosstalk of 120-cycle-coated MOF was measured as 0.5 ± 0.2 nm and 0.5 ± 0.1 nm in the humidity range of 50–75% relative humidity (RH) and temperature range of 20–25 °C, respectively.

A luminescent metal–organic framework with mixed-linker strategy for white-light-emitting by iridium-complex encapsulation

2021 ◽  
Vol 123 ◽  
pp. 108359
Author(s):  
Shu-Ran Zhang ◽  
Guang-Juan Xu ◽  
Wei Xie ◽  
Yan-Hong Xu ◽  
Zhong-Min Su
Keyword(s):  
White Light ◽  
Metal Organic Framework ◽  
Iridium Complex ◽  
Light Emitting ◽  
Metal Organic ◽  
Organic Framework
Sign in / Sign up

Export Citation Format

Share Document