Effect of molecular weight on the efficiency of poly(N-vinylcarbazole)-based polymer light-emitting diodes

被引：15

作者：

Cai, Min ^{[3
,4
]}

Xiao, Teng ^{[3
,4
]}

Chen, Ying ^{[3
,4
]}

Hellerich, Emily ^{[3
,4
]}

Liu, Rui ^{[3
,4
]}

Shinar, Ruth ^{[1
,2
]}

Shinar, Joseph ^{[3
,4
]}

机构：

[1] Iowa State Univ, Microelect Res Ctr, Ames, IA 50011 USA

[2] Iowa State Univ, Dept Elect & Comp Engn, Ames, IA 50011 USA

[3] Iowa State Univ, Ames Lab USDOE, Ames, IA 50011 USA

[4] Iowa State Univ, Dept Phys & Astron, Ames, IA 50011 USA

来源：

APPLIED PHYSICS LETTERS | 2011年 / 99卷 / 20期

关键词：

DEVICES; LAYER;

D O I：

10.1063/1.3659467

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

Polymer light-emitting diodes based on poly(N-vinylcarbazole) (PVK) with molecular weights M-W of 1.1 x 10(6) and similar to 7.5 x 10(4) are compared. For devices without an electron transport layer (ETL), the high M-W PVK yields higher external quantum efficiency (0.67% vs 0.18%), but for devices with an ETL, the low MW PVK yields higher efficiency (1.13% vs 0.83%). This intriguing difference is believed to result from higher energetic disorder in the high M-W polymer and different recombination zone-quenching metal electrode distances, in agreement with Konezny et al. [Appl. Phys. Lett. 97, 143305 (2010)]. (C) 2011 American Institute of Physics. [doi:10.1063/1.3659467]

引用

页数：3

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