Europium-activated barium/strontium silicates for near-UV light emitting diode applications

被引：20

作者：

Han, J. K. ^{[1
]}

Hannah, M. E. ^{[2
]}

Piquette, A. ^{[2
]}

Micone, J. ^{[1
]}

Hirata, G. A. ^{[3
]}

Talbot, J. B. ^{[1
,4
]}

Mishra, K. C. ^{[2
]}

McKittrick, J. ^{[1
,5
]}

机构：

[1] Univ Calif San Diego, Mat Sci & Engn Program, La Jolla, CA 92093 USA

[2] OSRAM SYLVANIA Cent Res, Beverly, MA 01915 USA

[3] Univ Nacl Autonoma Mexico, Ctr Nanociencias & Nanotecnol, Ensenada 22860, MX, Mexico

[4] Univ Calif San Diego, Dept Nanoengn, La Jolla, CA 92093 USA

[5] Univ Calif San Diego, Dept Mech & Aerosp Engn, La Jolla, CA 92093 USA

来源：

JOURNAL OF LUMINESCENCE | 2013年 / 133卷

关键词：

Silicate phosphors; Quantum efficiency; Thermal stability; White-emitting LEDs; WHITE; PHOSPHORS; BETA-REVERSIBLE-ALPHA'; TRANSITION; EMISSION; GREEN; LEDS; RED;

D O I：

10.1016/j.jlumin.2011.12.055

中图分类号：

O43 [光学];

学科分类号：

070207 ; 0803 ;

摘要：

This paper reports on the luminescence properties of submicron-sized green-yellow emitting (Ba1-xSrxEu0.03)(2)SiO4 (0 <= x <= 1) phosphors. These phosphors were prepared by a modified sol-gel/Pechini method. The X-ray diffraction analysis shows that the single phase products are obtained. The particle size - ranges from 200 to 500 nm with a spherical or needlelike shape depending on x. These phosphors show strong absorption in the near UV range and the photoluminescence emission spectra consist of a strong broad green-yellow band centered between 512 and 570 nm, depending on x. Furthermore, the phosphors have high quantum efficiencies: 94% for x=0 and 85% for x=0.25. The emission lifetime at 400 K is 97% of that at 40 K, demonstrating good thermal stability. (c) 2011 Elsevier B.V. All rights reserved.

引用

页码：184 / 187

页数：4

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