Tuning of emission color for blue dendrimer blend light-emitting diodes

被引:53
作者
Markham, JPJ [1 ]
Namdas, EB
Anthopoulos, TD
Samuel, IDW
Richards, GJ
Burn, PL
机构
[1] Univ St Andrews, Sch Phys & Astron, Organ Semicond Ctr, St Andrews KY16 9SS, Fife, Scotland
[2] Univ Oxford, Dept Chem, Chem Res Lab, Oxford OX1 3TA, England
基金
英国工程与自然科学研究理事会;
关键词
D O I
10.1063/1.1784521
中图分类号
O59 [应用物理学];
学科分类号
摘要
We demonstrate efficient tunable blue electroluminescence from blends of two solution-processible light-emitting dendrimers. These materials can be blended to form optical quality thin films with no phase-separation effects, irrespective of the blend ratio. External quantum efficiencies of 1% have been measured for the blend systems and the emission color can be tuned from deep blue (emission peak 401 nm) to blue green (477 nm) by blend composition. A power efficiency of 1.5 lm/W (at 200 Cd/m(2) and 5.4 V) is measured for a single layer, first-generation blue-green fluorene-thiophene dendrimer. These results show that by choice of a dendrimer structure with common branching units and surface groups, dissimilar cores can be blended with excellent miscibility. This provides a simple way of tuning the color of organic light-emitting diodes. (C) 2004 American Institute of Physics.
引用
收藏
页码:1463 / 1465
页数:3
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