White organic light-emitting devices with CdSe/ZnS quantum dots as a red emitter

被引：112

作者：

Li, YQ ^{[1
]}

Rizzo, A ^{[1
]}

Mazzeo, M ^{[1
]}

Carbone, L ^{[1
]}

Manna, L ^{[1
]}

Cingolani, R ^{[1
]}

Gigli, G ^{[1
]}

机构：

[1] Univ Lecce, INFM, NNL, I-73100 Lecce, Italy

来源：

JOURNAL OF APPLIED PHYSICS | 2005年 / 97卷 / 11期

关键词：

D O I：

10.1063/1.1921341

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

White hybrid organic/inorganic light-emitting devices (LEDs) have been fabricated by using stable red-emitting CdSe/ZnS core-shell quantum dots (QDs) covered with a trioctylphosphine oxide organic ligand. The device-active structure consists in a host/guest system with a blue-emitting poly[(9,9-dihexyloxyfluoren-2,7-diyl)-alt-co-(2-methoxy-5-{2-ethylhexyloxy}phenylen-1,4-diyl)] (PFH-MEH) polymer doped with red-emitting QDs and a green emitting metal chelate complex Alq(3), with improved electron injection and transfer properties. A fairly pure white OLED with Commission Internationale de l'Eclairage coordinates of (0.30,0.33) is fabricated by accurate control of the Forster energy and charge-transfer mechanisms between the different device constituents obtained by tuning the concentration ratio of the QDs/PFH-MEH blend. In particular, charge-transfer processes to CdSe/ZnS core-shell quantum dots are found to be the key element for well-balanced white emission. Maximum external quantum efficiency up to 0.24% at 1 mA cm(-2) and 11 V in air atmosphere are reported, showing that hybrid LEDs can be a promising route towards more stable and efficient light-emitting devices for lighting applications. (C) 2005 American Institute of Physics.

引用

页数：4

共 25 条

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