ZnSe-based white LEDs

被引：76

作者：

Katayama, K ^{[1
]}

Matsubara, H ^{[1
]}

Nakanishi, F ^{[1
]}

Nakamura, T ^{[1
]}

Doi, H ^{[1
]}

Saegusa, A ^{[1
]}

Mitsui, T ^{[1
]}

Matsuoka, T ^{[1
]}

Irikura, M ^{[1
]}

Takebe, T ^{[1
]}

Nishine, S ^{[1
]}

Shirakawa, T ^{[1
]}

机构：

[1] Sumitomo Elect Ind Ltd, Basic High Technol Labs, Konohana Ku, Osaka 5540024, Japan

来源：

JOURNAL OF CRYSTAL GROWTH | 2000年 / 214卷

关键词：

ZnSe; white; LED; self-activated; conductive; photoluminescence;

D O I：

10.1016/S0022-0248(00)00275-X

中图分类号：

O7 [晶体学];

学科分类号：

0702 ; 070205 ; 0703 ; 080501 ;

摘要：

The first phosphor-free white LED based on II-IV compound materials is demonstrated. Our device utilizes a phenomenon unique to ZnSe homoepitaxy, where a portion of the main greenish-blue emission from the active layer of a pn junction diode is absorbed by the conductive substrate which in turn gives off an intense broad-band yellow emission centered around 585 nm by photoluminescence. These two emission bands combine to give a spectrum which appears while to the naked eye. A typical ZnSe-based white LED lamp exhibits a color temperature of approximately 3400 K with a CRI (color rendering index) of 68. The optical output power and operating voltage of such a device at a forward current of 20 mA is 2.0 mW and 2.7 V, respectively. The luminous efficiency estimated from these results is 10.41 m/W, which is comparable to the incandescent lamp as well as the commercial InGaN-based white LED. Device lifetimes (half-life) have exceeded 800 h at 20 degrees C. (C) 2000 Elsevier Science B.V. All rights reserved.

引用

页码：1064 / 1070

页数：7

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