Improved color rendering index and thermal stability of white LEDs with phosphor-in-glass using the SiO2-B2O3-ZnO-Na2O glass system

2016 ◽  
Vol 445-446 ◽  
pp. 77-80 ◽  
Author(s):  
Karam Han ◽  
Sang Hun Lee ◽  
Yong Gyu Choi ◽  
Won Bin Im ◽  
Woon Jin Chung
Keyword(s):  
Thermal Stability ◽  
Glass System ◽  
White Leds ◽  
Color Rendering Index ◽  
Color Rendering ◽  
Thermal Stability Of

scholarly journals Efficient spectral regulation in Ce:Lu3(Al,Cr)5O12 and Ce:Lu3(Al,Cr)5O12/Ce:Y3Al5O12 transparent ceramics with high color rendering index for high-power white LEDs/LDs

2021 ◽  
Author(s):  
Tianyuan Zhou ◽  
Chen Hou ◽  
Le Zhang ◽  
Yuelong Ma ◽  
Jian Kang ◽  
...  
Keyword(s):  
Thermal Stability ◽  
High Power ◽  
White Led ◽  
Transparent Ceramics ◽  
Photoluminescence Excitation ◽  
Unilateral Shift ◽  
Excitation Mode ◽  
White Leds ◽  
Color Rendering Index ◽  
Color Rendering

AbstractRealizing a high color rendering index (CRI) in Ce:LuAG transparent ceramics (TCs) with desired thermal stability is essential to their applications in white LEDs/LDs as color converters. In this study, based on the scheme of configuring the red component by Cr3+ doping, an efficient spectral regulation was realized in Ce,Cr:LuAG TCs. A unilateral shift phenomenon could be observed in both photoluminescence (PL) and photoluminescence excitation (PLE) spectra of TCs. By constructing TC-based white LED/LD devices in a remote excitation mode, luminescence properties of Ce,Cr:LuAG TCs were systematically investigated. The CRI values of Ce:LuAG TC based white LEDs could be increased by a magnitude of 46.2%. Particularly, by combining the as fabricated Ce,Cr:LuAG TCs with a 0.5 at% Ce:YAG TC, surprising CRI values of 88 and 85.5 were obtained in TC based white LEDs and LDs, respectively. Therefore, Ce,Cr:LuAG TC is a highly promising color convertor for high-power white LEDs/LDs applied in general lighting and displaying.

Silica-encapsulated semiconductor polymer dots as stable phosphors for white light-emitting diodes

2015 ◽  
Vol 3 (28) ◽  
pp. 7281-7285 ◽  
Author(s):  
Kaiwen Chang ◽  
Xiaoju Men ◽  
Haobin Chen ◽  
Zhihe Liu ◽  
Shengyan Yin ◽  
...  
Keyword(s):  
Thermal Stability ◽  
White Light ◽  
Light Emitting Diodes ◽  
Light Emitting ◽  
Light Emitting Devices ◽  
Polymer Dots ◽  
Color Rendering Index ◽  
White Light Emitting Diodes ◽  
Color Rendering ◽  
Thermal Stability Of

Semiconductor polymer dots were encapsulated into a SiO2matrix to form highly fluorescent nanocomposites. The photostability and thermal stability of nanocomposites were greatly improved, making them promising candidates for white-light emitting devices with a high color-rendering index.

scholarly journals Efficient Spectral Regulation in Ce:Lu3(Al,Cr)5O12 and Ce:Lu3(Al,Cr)5O12/Ce:Y3Al5O12 Transparent Ceramics With High Color Rendering Index for High-Power White LEDs/LDs

2021 ◽  
Author(s):  
Tianyuan Zhou ◽  
Chen Hou ◽  
Le Zhang ◽  
Yuelong Ma ◽  
Jian Kang ◽  
...  
Keyword(s):  
Thermal Stability ◽  
High Power ◽  
Luminescence Properties ◽  
White Led ◽  
Transparent Ceramics ◽  
Unilateral Shift ◽  
Excitation Mode ◽  
White Leds ◽  
Color Rendering Index ◽  
Color Rendering

Abstract Realizing a high color rendering index (CRI) in Ce:LuAG transparent ceramics (TCs) with desired thermal stability is essential to their applications in white LEDs/LDs as color converters. In this study, based on the scheme of configuring the red component by Cr3+ doping, an efficient spectral regulation was realized in Ce,Cr:LuAG TCs. A unilateral shift could be observed in both PL and PLE spectra. By constructing TC-based white LED/LD devices in a remote excitation mode, luminescence properties of Ce,Cr:LuAG TCs were systematically investigated. The CRI values of Ce:LuAG TC based white LEDs could be increased by a magnitude of 46.2%. Particularly, by combining Ce,Cr:LuAG TCs with a 0.5 at.% Ce:YAG TC, a surprising CRI values of 88 and 85.5 were obtained in TC based white LEDs and LDs, respectively. Therefore, Ce,Cr:LuAG TC is a highly promising color convertor for high-power white LEDs/LDs applied in general lighting and displaying.

Effects of additives on the thermal stability of silver tellurite glass system

2022 ◽  
Vol 165 ◽  
pp. 108683
Author(s):  
Hyun Woo Kang ◽  
Jung-Hoon Choi ◽  
Ki Rak Lee ◽  
Hwan-Seo Park
Keyword(s):  
Thermal Stability ◽  
Tellurite Glass ◽  
Glass System ◽  
Thermal Stability Of

Improvement the thermal stability of bluish-cyan emitting phosphor Y2MgAl4SiO12:Eu2+ using substitution cations (Zn, Ca, Sr) for white LEDs

CrystEngComm ◽  
2021 ◽  
Author(s):  
Huifang Yang ◽  
Panlai Li ◽  
Zejun Ye ◽  
Xiaoxue Huo ◽  
Yu Wang ◽  
...  
Keyword(s):  
Thermal Stability ◽  
Solid State ◽  
Solid State Method ◽  
White Leds ◽  
State Method ◽  
Thermal Stability Of

A series of bluish-cyan color adjustable phosphors Y2MgAl4SiO12:xEu2+(YMAS) and Y2(Mg1-y,My)Al4SiO12:Eu2+ (M=Zn, Ca, Sr) were synthesized by the solid-state method. The thermal stability can be improved by modifying cation, especially, the...

Highly efficient Ce3+ → Tb3+ energy transfer induced bright narrowband green emissions from garnet-type Ca2YZr2(AlO4)3:Ce3+,Tb3+ phosphors for white LEDs with high color rendering index

2019 ◽  
Vol 7 (34) ◽  
pp. 10471-10480 ◽  
Author(s):  
Liangling Sun ◽  
Balaji Devakumar ◽  
Jia Liang ◽  
Shaoying Wang ◽  
Qi Sun ◽  
...  
Keyword(s):  
Energy Transfer ◽  
White Leds ◽  
Highly Efficient ◽  
Color Rendering Index ◽  
Color Rendering

Highly efficient Ce3+ → Tb3+ energy transfer induced bright narrowband green emissions from Ca2YZr2(AlO4)3:Ce3+,Tb3+ garnet phosphors, which showed great potential for application in warm-white LEDs with high color rendering index.

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