Luminescence properties of Li2SrSiO4:Eu2+ silicate yellow phosphors with high thermal stability for high-power efficiency white LED application

2019 ◽  
Vol 207 ◽  
pp. 22-28 ◽  
Author(s):  
Siti Sarina Binti Nasir ◽  
Akihiro Tanaka ◽  
Shuto Yoshiara ◽  
Ariyuki Kato
Keyword(s):  
Thermal Stability ◽  
High Power ◽  
Power Efficiency ◽  
High Thermal Stability ◽  
Luminescence Properties ◽  
White Led ◽  
High Power Efficiency

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.

Design Technique of High Power Efficiency LLC DC-DC Converters for Photovoltaic Cells

2018 ◽  
Vol 2 (1) ◽  
pp. 30
Author(s):  
Hisatsugu Kato ◽  
Yoichi Ishizuka ◽  
Kohei Ueda ◽  
Shotaro Karasuyama ◽  
Atsushi Ogasahara
Keyword(s):  
High Power ◽  
Power Efficiency ◽  
Photovoltaic Cells ◽  
Input Voltage ◽  
Design Technique ◽  
Load Range ◽  
Voltage Range ◽  
Simulation Results ◽  
Secondary Side ◽  
High Power Efficiency

This paper proposes a design technique of high power efficiency LLC DC-DC Converters for Photovoltaic Cells. The secondary side circuit and transformer fabrication of proposed circuit are optimized for overcoming the disadvantage of limited input voltage range and, realizing high power efficiency over a wide load range of LLC DC-DC converters. The optimized technique is described with theoretically and with simulation results. Some experimental results have been obtained with the prototype circuit designed for the 80 - 400 V input voltage range. The maximum power efficiency is 98 %.

An area-saving and high power efficiency charge pump built in a TFT-LCD driver IC

2009 ◽  
Vol 30 (9) ◽  
pp. 095015
Author(s):  
Zheng Ran ◽  
Wei Tingcun ◽  
Wang Jia ◽  
Gao Deyuan
Keyword(s):  
High Power ◽  
Power Efficiency ◽  
Charge Pump ◽  
Lcd Driver ◽  
High Power Efficiency

Interface and thickness tuning for blade coated small-molecule organic light-emitting diodes with high power efficiency

2013 ◽  
Vol 114 (12) ◽  
pp. 123101 ◽  
Author(s):  
Yu-Fan Chang ◽  
Yu-Chian Chiu ◽  
Hao-Wen Chang ◽  
Yi-Siang Wang ◽  
Yi-Lun Shih ◽  
...  
Keyword(s):  
Small Molecule ◽  
High Power ◽  
Power Efficiency ◽  
Light Emitting Diodes ◽  
Organic Light Emitting Diodes ◽  
Light Emitting ◽  
Organic Light ◽  
High Power Efficiency
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