Dual effect synergistically triggered Ce:(Y,Tb)3(Al,Mn)5O12 transparent ceramics enabling a high color-rendering index and excellent thermal stability for white LEDs

2020 ◽  
Author(s):  
Yuelong Ma ◽  
Le Zhang ◽  
Tianyuan Zhou ◽  
Bingheng Sun ◽  
Chen Hou ◽  
...  
Keyword(s):  
Thermal Stability ◽  
Transparent Ceramics ◽  
Dual Effect ◽  
Excellent Thermal Stability ◽  
White Leds ◽  
Color Rendering Index ◽  
Color Rendering

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.

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.

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.

Efficient and stable Sr3Eu2B4O12 red phosphor benefiting from low symmetry and distorted local environment

2020 ◽  
Vol 49 (10) ◽  
pp. 3260-3271 ◽  
Author(s):  
Gui-Hua Li ◽  
Nian Yang ◽  
Jian-Gang Guo ◽  
Zheng-Liang Wang ◽  
Ge-Mei Cai ◽  
...  
Keyword(s):  
Thermal Stability ◽  
Local Environment ◽  
Color Purity ◽  
Excellent Thermal Stability ◽  
Red Phosphor ◽  
Color Rendering Index ◽  
Color Rendering ◽  
Low Symmetry

In Sr3Eu2B4O12 phosphor with 100% activator Eu3+, the disorderly co-occupation of Sr and Eu evokes excellent thermal stability and perfect color purity. This new red phosphor is applied to fabricate a warm WLED with good color rendering index.

High recorded color rendering index in single Ce,(Pr,Mn):YAG transparent ceramics for high-power white LEDs/LDs

2020 ◽  
Vol 8 (13) ◽  
pp. 4329-4337 ◽  
Author(s):  
Yuelong Ma ◽  
Le Zhang ◽  
Tianyuan Zhou ◽  
Bingheng Sun ◽  
Yun Wang ◽  
...  
Keyword(s):  
High Power ◽  
Transparent Ceramics ◽  
White Leds ◽  
Color Rendering Index ◽  
Color Rendering

A recorded CRI of 84.8 in Ce,(Pr,Mn):YAG TCs for high-power LEDs/LDs was achieved by the synchronous doping of Pr3+ and Mn2+ ions.

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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