Effect of cathodes on high efficiency inorganic-organic hybrid LEDs based on CdSe/ZnS quantum dots

被引：14

作者：

Nguyen Huu Tuan ^{[1
]}

Koh, Ken Ha ^{[1
]}

Pham Thu Nga ^{[2
]}

Lee, Soonil ^{[1
]}

机构：

[1] Ajou Univ, Div Energy Syst Res, Suwon 443749, South Korea

[2] VAST, Inst Mat Sci, Lab Mat & Engn Fiber Opt, Hanoi, Vietnam

来源：

JOURNAL OF CRYSTAL GROWTH | 2011年 / 326卷 / 01期

基金：

新加坡国家研究基金会;

关键词：

Energy barrier; CdSe/ZnS; Metal cathode; Quantum dot; Hybrid LED; LIGHT-EMITTING-DIODES; SEMICONDUCTING POLYMER; NANOCRYSTALS; DEVICES; ELECTROLUMINESCENCE; MONOLAYERS; BRIGHT; METAL;

D O I：

10.1016/j.jcrysgro.2011.01.063

中图分类号：

O7 [晶体学];

学科分类号：

0702 ; 070205 ; 0703 ; 080501 ;

摘要：

Inorganic-organic hybrid light emitting devices (HLEDs) with CdSe/ZnS quantum dot (QD) emitting layers are fabricated, and the variation of their operation characteristics with respect to a cathode material selection among Au, Al, and LiF/Al is investigated. All three types of QD-based HLEDs show orange-color emission, centered at 580 nm with a full-width at half-maximum of 50 nm, regardless of cathode material. However, quantitatively, the QD-HLED with a LiF/Al-cathode shows much larger current density and luminance compared to the other QD-HLEDs, owing to better electron injection. Moreover, the respective maximum values of power efficiency and luminous yield of the LiF/Al-cathode HLED are as large as 1.27 lm/W and 2.42 cd/A. (C) 2011 Elsevier B.V. All rights reserved.

引用

页码：109 / 112

页数：4

共 17 条

[1] Size-tunable infrared (1000-1600 nm) electroluminescence from PbS quantum-dot nanocrystals in a semiconducting polymer [J].

Bakueva, L ;

Musikhin, S ;

Hines, MA ;

Chang, TWF ;

Tzolov, M ;

Scholes, GD ;

Sargent, EH .

APPLIED PHYSICS LETTERS, 2003, 82 (17) :2895-2897

[2] Electroluminescence from single monolayers of nanocrystals in molecular organic devices [J].

Coe, S ;

Woo, WK ;

Bawendi, M ;

Bulovic, V .

NATURE, 2002, 420 (6917) :800-803

[3] Large-area ordered quantum-dot monolayers via phase separation during spin-casting [J].

Coe-Sullivan, S ;

Steckel, JS ;

Woo, WK ;

Bawendi, MG ;

Bulovic, V .

ADVANCED FUNCTIONAL MATERIALS, 2005, 15 (07) :1117-1124

[4] Tuning the performance of hybrid organic/inorganic quantum dot light-emitting devices [J].

Coe-Sullivan, S ;

Woo, WK ;

Steckel, JS ;

Bawendi, M ;

Bulovic, V .

ORGANIC ELECTRONICS, 2003, 4 (2-3) :123-130

[5] (CdSe)ZnS core-shell quantum dots: Synthesis and characterization of a size series of highly luminescent nanocrystallites [J].

Dabbousi, BO ;

RodriguezViejo, J ;

Mikulec, FV ;

Heine, JR ;

Mattoussi, H ;

Ober, R ;

Jensen, KF ;

Bawendi, MG .

JOURNAL OF PHYSICAL CHEMISTRY B, 1997, 101 (46) :9463-9475

[6] Synthesis and characterization of strongly luminescing ZnS-Capped CdSe nanocrystals [J].

Hines, MA ;

Guyot-Sionnest, P .

JOURNAL OF PHYSICAL CHEMISTRY, 1996, 100 (02) :468-471

[7] Contact formation of LiF/Al cathodes in Alq-based organic light-emitting diodes [J].

Hung, LS ;

Zhang, RQ ;

He, P ;

Mason, G .

JOURNAL OF PHYSICS D-APPLIED PHYSICS, 2002, 35 (02) :103-107

[8]

Ishii H, 1999, ADV MATER, V11, P605, DOI 10.1002/(SICI)1521-4095(199906)11:8<605::AID-ADMA605>3.0.CO

[9]

2-Q

[10] Kinetics of charge carrier recombination in organic light-emitting diodes [J].

Kalinowski, J ;

Camaioni, N ;

Di Marco, P ;

Fattori, V ;

Martelli, A .

APPLIED PHYSICS LETTERS, 1998, 72 (05) :513-515

← 1 2 →