Light-emitting diodes with integrated omnidirectionally reflective contacts

被引：15

作者：

Gessmann, T ^{[1
]}

Luo, H ^{[1
]}

Xia, JQ ^{[1
]}

Streubel, K ^{[1
]}

Schubert, EF ^{[1
]}

机构：

[1] Rensselaer Polytech Inst, Dept Elect Comp & Syst Engn, Troy, NY 12180 USA

来源：

LIGHT -EMITTING DIODES: RESEARCH, MANUFACTURING, AND APPLICATIONS VIII | 2004年 / 5366卷

关键词：

D O I：

10.1117/12.527952

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

An electrically conductive onmidirectional reflector (ODR) is demonstrated as p-type ohmic contact for an AlGaInP light-emitting diode (LED). The ODR comprises the semiconductor, a Ag metal layer and an intermediate SiO2 low-refractive index dielectric layer. The SiO2 layer, located between the LED semiconductor and the silver layer, is perforated by an array of AuZn micro-contacts thus enabling electrical conductivity. It is shown that the ODR-LED has a significantly higher light-extraction efficiency as compared to LEDs employing distributed Bragg reflectors (DBRs). For devices emitting in the red wavelength range, external quantum efficiencies of 18% and 11% are obtained for ODR- and DBR-LEDs, respectively. The performance of the ODR-LED can be further increased by replacing the SiO2 dielectric with materials having a refractive index much less than 1.45. Performance characteristics of such powerful reflectors will be presented.

引用

页码：53 / 61

页数：9

共 8 条

[1] 1.4x efficiency improvement in transparent-substrate (AlxGa1-x)0.5In0.5P light-emitting diodes with thin (≤2000 Å) active regions [J].

Gardner, NF ;

Chui, HC ;

Chen, EI ;

Krames, MR ;

Huang, JW ;

Kish, FA ;

Stockman, SA ;

Kocot, CP ;

Tan, TS ;

Moll, N .

APPLIED PHYSICS LETTERS, 1999, 74 (15) :2230-2232

[2]

GESSMANN T, 2003, SPIE P SERIES, V4996

[3]

Illek S., 2002, Compound Semiconductor, V8, P39

[4] High-power truncated-inverted-pyramid (AlxGa1-x)0.5In0.5P/GaP light-emitting diodes exhibiting >50% external quantum efficiency [J].

Krames, MR ;

Ochiai-Holcomb, M ;

Höfler, GE ;

Carter-Coman, C ;

Chen, EI ;

Tan, IH ;

Grillot, P ;

Gardner, NF ;

Chui, HC ;

Huang, JW ;

Stockman, SA ;

Kish, FA ;

Craford, MG ;

Tan, TS ;

Kocot, CP ;

Hueschen, M ;

Posselt, J ;

Loh, B ;

Sasser, G ;

Collins, D .

APPLIED PHYSICS LETTERS, 1999, 75 (16) :2365-2367

[5]

LI YL, 2003, SPIE ANN M SAN DIEG

[6]

Macleod H.A., 1986, THIN FILM OPTICAL FI, P35

[7]

ROOMAN C, 2003, SPIE P SERIES, V4996, P40

[8]

WIRTH R, 2003, SPIE P SERIES, V4996, P1

← 1 →