Luminescence properties of poly(9,9-dioctylfluorene)/polyvinylcarbazole blends: Role of composition on the emission colour stability and electroluminescence efficiency

被引：19

作者：

Bernardo, Gabriel ^{[1
]}

Charas, Ana ^{[1
]}

Morgado, Jorge ^{[1
,2
]}

机构：

[1] Univ Tecn Lisboa, Inst Telecomunicacoes, Inst Super Tecn, P-1049001 Lisbon, Portugal

[2] Univ Tecn Lisboa, Dept Eng Quim & Biol, Inst Super Tecn, P-1049001 Lisbon, Portugal

来源：

JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS | 2010年 / 71卷 / 03期

关键词：

Polymers; Luminescence; Optical properties; Transport properties; LIGHT-EMITTING-DIODES; BLUE EMISSION; POLYMER; MORPHOLOGY;

D O I：

10.1016/j.jpcs.2009.12.087

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

Light-emitting diodes (LEDs), based on blue-emitting polyfluorenes are usually prone to the appearance of a contaminant green emission (centered around 520 nm), leading to an apparent whitish light emission. We find that, for LEDs based on poly(9,9-dioctylfluorene), PFO, the blending with the hole transporting polyvinylcarbazole, PVK, can suppress such green emission. LEDs based on a PFO/PVK blend with a 1:2 weight ratio and with aluminum cathodes show a quite stable blue emission. This result reveals the important role played by the interchain interactions on the observed contaminant green emission. In addition, we observe that in Al-based devices blending causes a decrease in EL efficiency while in Mg-based devices we obtained higher efficiencies with the blend PFO:3PVK when compared with neat PFO-based devices. (C) 2010 Elsevier Ltd. All rights reserved.

引用

页码：340 / 345

页数：6

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