scholarly journals Optical Properties of Red-Emitting Rb2Bi(PO4)(MoO4):Eu3+ Powders and Ceramics with High Quantum Efficiency for White LEDs

Materials ◽  
2019 ◽  
Vol 12 (19) ◽  
pp. 3275 ◽  
Author(s):  
Grigorjevaite ◽  
Ezerskyte ◽  
Minderyte ◽  
Stanionyte ◽  
Juskenas ◽  
...  
Keyword(s):  
Optical Properties ◽  
Quantum Efficiency ◽  
Red Light ◽  
Light Sources ◽  
Quenching Temperature ◽  
High Quantum Efficiency ◽  
White Leds ◽  
High Quantum ◽  
Powder Samples ◽  
Colour Coordinates

There are several key requirements that a very good LED phosphor should meet, i.e., strong absorption, high quantum efficiency, high colour purity, and high luminescence quenching temperature. The reported Rb2Bi(PO4)(MoO4):Eu3+ phosphors have all these properties. The Rb2Bi(PO4)(MoO4):Eu3+ phosphors emit bright red light if excited with near-UV radiation. The calculated colour coordinates show good stability in the 77–500 K temperature range. Moreover, sample doped with 50% Eu3+ possesses quantum efficiency close to unity. Besides the powder samples, ceramic disks of Rb2Eu(PO4)(MoO4) specimen were also prepared, and the red light sources from these disks in combination with near-UV emitting LED were fabricated. The obtained results indicated that ceramic disks efficiently absorb the emission of 375 and 400 nm LED and could be applied as a red component in phosphor-converted white LEDs.

Modulation of optical properties of ZnS QDs embedded glasses through aluminum and manganese doping

2021 ◽  
Author(s):  
Kai Li ◽  
Ying Ye ◽  
Wenchao Zhang ◽  
Yuzhou Hu ◽  
Ying Yang ◽  
...  
Keyword(s):  
Optical Properties ◽  
Quantum Efficiency ◽  
High Quantum Efficiency ◽  
Information Display ◽  
Manganese Doping ◽  
High Quantum

Nontoxic cadmium-free ZnS and ZnSe QDs QDs with high quantum efficiency have drawn considerable attention for information display. Applications of ZnS and ZnSe QDs are limited by their short emission...

ZnSe:Mn/ZnS High Temperature Nanophosphors with Very High Quantum Efficiency for White LEDs

2012 ◽  
Author(s):  
Brian A. Akins ◽  
Antonio C. Rivera ◽  
Nathaniel C. Cook ◽  
Gennady A. Smolyakov ◽  
Marek Osiński
Keyword(s):  
High Temperature ◽  
Quantum Efficiency ◽  
High Quantum Efficiency ◽  
White Leds ◽  
High Quantum ◽  
Very High

High quantum efficiency Ce:(Lu,Y)3(Al,Sc)2Al3O12 transparent ceramics with excellent thermal stability for high-power white LEDs/LDs

2020 ◽  
Vol 8 (46) ◽  
pp. 16427-16435
Author(s):  
Yuelong Ma ◽  
Le Zhang ◽  
Tianyuan Zhou ◽  
Chen Hou ◽  
Jian Kang ◽  
...  
Keyword(s):  
Thermal Stability ◽  
Quantum Efficiency ◽  
High Power ◽  
Light Emitting Diode ◽  
Transparent Ceramics ◽  
High Quantum Efficiency ◽  
Excellent Thermal Stability ◽  
Light Emitting ◽  
White Leds ◽  
High Quantum

Transparent ceramics (TCs) with high quantum efficiency and excellent thermal stability are essential for the applications in high-power remote excitation white light-emitting diode or laser diode (LED/LD) lighting devices as color convertors.

Simultaneous, non-interfering collection of optimal fluorescent and backscattered light signals on the MRC 500/600

1993 ◽  
Vol 51 ◽  
pp. 156-157
Author(s):  
JB Pawley ◽  
WB Amos ◽  
A Dixon ◽  
TC Brelje
Keyword(s):  
Optical Properties ◽  
Quantum Efficiency ◽  
Fluorescent Dyes ◽  
Living Cells ◽  
Microscopical Examination ◽  
High Quantum Efficiency ◽  
Fluorescent Signal ◽  
High Quantum ◽  
Signal Collection ◽  
Light Signals

One of the most important attributes of the confocal LM is that it can be used for imaging living cells. Unfortunately, cells that contain fluorescent dyes are far less tolerant of the intense illumination characteristic of microscopical examination than unstained cells. As a result, it early became evident that every effort should be made to extract as much information as possible from every photon striking the specimen. This implies not only utilizing detectors with high quantum efficiency but also detecting the light which is back-scattered by (BSL), or passing through, the specimen in addition to any fluorescent signal. Both transmitted light and BSL carry information about the optical properties of the specimen and it is possible to detect this information without compromising fluorescent signal collection.

scholarly journals Novel Eu3+-activated Ba2Y5B5O17 red-emitting phosphors for white LEDs: high color purity, high quantum efficiency and excellent thermal stability

RSC Advances ◽  
2018 ◽  
Vol 8 (41) ◽  
pp. 23323-23331 ◽  
Author(s):  
G. Annadurai ◽  
Balaji Devakumar ◽  
Heng Guo ◽  
R. Vijayakumar ◽  
Bin Li ◽  
...  
Keyword(s):  
Thermal Stability ◽  
Quantum Efficiency ◽  
Color Purity ◽  
High Quantum Efficiency ◽  
Excellent Thermal Stability ◽  
White Leds ◽  
High Quantum ◽  
High Color Purity ◽  
Red Emitting Phosphor

A novel Ba2Y5B5O17:Eu3+ red-emitting phosphor with high color purity, high quantum efficiency and excellent thermal stability was developed.

scholarly journals Red phosphor based on Eu3+-isoelectronically doped Ba2SiO4 obtained via sol–gel route for solid state lightning

RSC Advances ◽  
2017 ◽  
Vol 7 (85) ◽  
pp. 53752-53762 ◽  
Author(s):  
Airton G. Bispo ◽  
Diego A. Ceccato ◽  
Sergio A. M. Lima ◽  
Ana. M. Pires
Keyword(s):  
Solid State ◽  
Quantum Efficiency ◽  
Sol Gel ◽  
High Quantum Efficiency ◽  
Red Phosphor ◽  
White Leds ◽  
High Quantum

Ba2SiO4:Eu3+ red phosphor with high quantum efficiency synthesized via sol–gel route as a candidate to white LEDs component is introduced. An approach for the 0–0 Eu3+ transition anomalous emission due to Eu3+–O2− associates is also provided.

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