Bandgap trimming and optical properties of Si3N4:Al microbelt phosphors for warm white light-emitting diodes

CrystEngComm ◽  
2019 ◽  
Vol 21 (43) ◽  
pp. 6566-6573
Author(s):  
Dongyi Shen ◽  
Yiran Shao ◽  
Yingchun Zhu
Keyword(s):  
Optical Properties ◽  
Solid State ◽  
White Light ◽  
Light Emitting Diodes ◽  
Bandgap Energy ◽  
Light Emitting ◽  
Warm White Light ◽  
Yellow Orange ◽  
White Light Emitting Diodes ◽  
Blue Chip

The bandgap energy of Si3N4:Al is precisely and gradually tailored from 2.58 to 2.85 eV by increasing the Al concentration. Si3N4:Al:Eu phosphors exhibiting a yellow-orange emission are promising for solid-state warm white lighting under blue chip excitation.

Novel Mn4+-activated layered oxide-fluoride perovskite-type KNaMoO2F4 red phosphor for wide gamut warm white light-emitting diodes backlight

2021 ◽  
Author(s):  
Jiao Wu ◽  
Bo Wang ◽  
Zhiyuan Liu ◽  
Kang Zhang ◽  
Xiaoshuang Li ◽  
...  
Keyword(s):  
Solid State ◽  
White Light ◽  
Light Emitting Diodes ◽  
Solid State Lighting ◽  
Red Phosphor ◽  
Red Emission ◽  
Light Emitting ◽  
Warm White Light ◽  
White Light Emitting Diodes ◽  
Perovskite Type

Mn4+-activated oxidefluoride phosphors are attractive for application in wide solid-state lighting devices because of its distinct red emission at about 630 nm and the abundant storage of Mn4+ ion. However,...

scholarly journals The electronic and optical properties of a narrow-band red-emitting nanophosphor K2NaGaF6:Mn4+for warm white light-emitting diodes

2018 ◽  
Vol 6 (12) ◽  
pp. 3016-3025 ◽  
Author(s):  
Chunyan Jiang ◽  
Mikhail G. Brik ◽  
Lihua Li ◽  
Liyi Li ◽  
Jie Peng ◽  
...  
Keyword(s):  
Optical Properties ◽  
White Light ◽  
Light Emitting Diodes ◽  
Narrow Band ◽  
High Quality ◽  
Light Emitting ◽  
Electronic And Optical Properties ◽  
White Leds ◽  
Warm White Light ◽  
White Light Emitting Diodes

Here, we report a narrow band but efficient red nanophosphor K2NaGaF6:Mn4+for high quality warm white LEDs.

scholarly journals Color Rendering Index Thermal Stability Improvement of Glass-Based Phosphor-Converted White Light-Emitting Diodes for Solid-State Lighting

2014 ◽  
Vol 2014 ◽  
pp. 1-6 ◽  
Author(s):  
Chun-Chin Tsai
Keyword(s):  
Thermal Stability ◽  
Solid State ◽  
White Light ◽  
Light Emitting Diodes ◽  
Solid State Lighting ◽  
Light Emitting ◽  
Warm White Light ◽  
Color Rendering Index ◽  
White Light Emitting Diodes ◽  
Color Rendering

High color rendering index performance has been required for phosphor-converted warm-white light-emitting diodes (PC-WWLEDs) in lighting industry. The characteristics of low-temperature fabricated phosphor (yellow: Ce3+:YAG, green: Tb3+:YAG, and red: CaAlClSiN3:Eu2+) doped glass were presented for applications to high color rendering index warm-white-light-emitting diodes. Color coordinates (x, y) = (0.36, 0.29), quantum yield (QY) = 55.6%, color rending index (CRI) = 85.3, and correlated color temperature (CCT) = 3923 K were characterized. Glass-based PC-WWLEDs was found able to maintain good thermal stability for long-time high-temperature operation. QY decay, CRI remenance, and chromaticity shift were also analyzed for glass- and silicone-based high-power PC-WLEDs by thermal aging at 150°C and 250°C for industrial test standard’s aging time 1008 hours. Better than the silicone’s, thermal stability of glass-based PC-WLEDs has been improved. The resulted high color rendering index (CRI) glass phosphor potentially can be used as a phosphor layer for high-performance and low-cost PC-WLEDs used in next-generation indoor solid-state lighting applications.

53% Efficient Red Emissive Carbon Quantum Dots for High Color Rendering and Stable Warm White‐Light‐Emitting Diodes

2017 ◽  
Vol 29 (37) ◽  
pp. 1702910 ◽  
Author(s):  
Zifei Wang ◽  
Fanglong Yuan ◽  
Xiaohong Li ◽  
Yunchao Li ◽  
Haizheng Zhong ◽  
...  
Keyword(s):  
Quantum Dots ◽  
White Light ◽  
Light Emitting Diodes ◽  
Carbon Quantum Dots ◽  
Light Emitting ◽  
Warm White Light ◽  
White Light Emitting Diodes ◽  
Color Rendering
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