An excellent cyan-emitting orthosilicate phosphor for NUV-pumped white LED application

The Ba9Lu2Si6O24:Ce3+cyan phosphor has excellent luminescence properties and displays promising application in NUV-based white LEDs with high performance.

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High performance red/deep-red emitting phosphors for white LEDs

New Journal of Chemistry ◽

10.1039/d0nj00086h ◽

2020 ◽

Vol 44 (14) ◽

pp. 5354-5365 ◽

Cited By ~ 6

Author(s):

Marikumar Rajendran ◽

Sivakumar Vaidyanathan

Keyword(s):

Quantum Efficiency ◽

High Performance ◽

White Led ◽

Red Phosphor ◽

White Leds

NaSrGd(MoO4)3:Eu3+ red phosphor exhibits higher quantum efficiency (82%) and the fabricated white LED showed 74% CRI and 6823 K CCT.

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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

10.21203/rs.3.rs-142225/v1 ◽

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.

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Study of High-Power White LED's Lifetime Based on Accelerated Life Test

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.800.205 ◽

2013 ◽

Vol 800 ◽

pp. 205-209 ◽

Cited By ~ 1

Author(s):

De Sheng Li ◽

Nian Yu Zou ◽

Yun Cui Zhang ◽

Xiao Yang He ◽

Yi Yang

Keyword(s):

High Power ◽

Accelerated Life Test ◽

Reliability Test ◽

White Led ◽

Life Test ◽

Arrhenius Model ◽

White Leds ◽

Accelerated Life ◽

Temperature Levels

The study of LED reliability becomes more and more important with LED widely used in various areas, and accelerated life test (ALT) as an element of reliability test is widely used to predict the lifetime of LED. In this paper, ALTs have been carried out at various current levels and various temperature levels. In the current ALT experiment, three kinds of stressing currents were demonstrated for 1W white LEDs and lumen flux of the tested LEDs were studied, and based on Eyting model, lifetime of the tested LEDs is calculated about 6.86×105h. In the temperature ALT experiment, two kinds of stressing temperature were demonstrated for the same type of white LEDs and lumen flux were also studied, and based on Arrhenius model, lifetime of the tested LEDs is calculated about 7.41×105h. In addition, the color shifting velocity is faster than lumens depreciation velocity was observed in our experiment, which means the lifetime evaluating of white LED should be paid more attention.

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Novel double perovskite Na1-Eu1+/3MgWO6 (0 ≤ x ≤ 0.4) phosphors for white LEDs: Sol-gel controlled synthesis, microstructure and luminescence properties

Journal of Alloys and Compounds ◽

10.1016/j.jallcom.2021.161343 ◽

2021 ◽

pp. 161343

Author(s):

Huan Chen ◽

Jie Wang ◽

Yu Gao ◽

Shenghao Ai ◽

Zhengdong Wu ◽

...

Keyword(s):

Sol Gel ◽

Double Perovskite ◽

Luminescence Properties ◽

Controlled Synthesis ◽

White Leds

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White LED Energy-Efficient Drive Technology Based on Luminescent Relaxation Properties

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.347-353.1494 ◽

2011 ◽

Vol 347-353 ◽

pp. 1494-1497

Author(s):

Yi Zhang ◽

Jing Han ◽

Lian Fa Bai ◽

Qian Chen ◽

Guo Hua Gu

Keyword(s):

High Performance ◽

Leading Edge ◽

Pulse Excitation ◽

White Led ◽

Excitation Current ◽

Effective Utilization ◽

Relaxation Properties ◽

Attenuation Characteristic ◽

Driving Model ◽

Core Idea

This study is a high-performance, energy-saving drive technology for all pcLED based on luminescence relaxation properties. Its core idea is coordination between power driving model and pcLED relaxation properties. Compared with relative small pulse width, forward pulse excitation current can make pcLED luminescence tends to its saturation peak rapidly during this period because of the steep leading edge of relaxation properties. And in the vacant period of forward pulse excitation current, because of the chosen of best duty cycle, it will be the most effective utilization for luminescence afterglow which has slow attenuation characteristic.

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Synthesis of single-crystalline GeS nanoribbons for high sensitivity visible-light photodetectors

Journal of Materials Chemistry C ◽

10.1039/c5tc01435b ◽

2015 ◽

Vol 3 (31) ◽

pp. 8074-8079 ◽

Cited By ~ 66

Author(s):

Changyong Lan ◽

Chun Li ◽

Yi Yin ◽

Huayang Guo ◽

Shuai Wang

Keyword(s):

Visible Light ◽

Vapor Deposition ◽

High Performance ◽

Incident Light ◽

Chemical Vapor ◽

High Sensitivity ◽

Single Crystalline ◽

Promising Application ◽

Photo Detection ◽

First Time

Single-crystalline GeS nanoribbons were synthesized by chemical vapor deposition for the first time. The nanoribbon photodetectors respond to the entire visible incident light with a response edge at around 750 nm and a high responsivity, indicating their promising application for high performance broadband visible-light photo-detection.

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