Bright blue organic light-emitting diode with improved color purity using a LiF/Al cathode
Bright blue organic light-emitting diode with improved color purity using a LiF/Al cathode
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DOI：
10.1063/1.368299
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发表时间：
1998-08-15
影响因子：
3.2
通讯作者：
Armstrong, NR
中科院分区：
文献类型：
--
作者：
Shaheen, SE;Jabbour, GE;Armstrong, NR
我们报道了一种双层蓝色有机发光二极管，具有4,4'-双（2,2-二苯基乙烯基）-1,1'-联苯发射层和LiF/Al阴极，其外部量子效率为1.4%，最大亮度为3000 cd/m(2)。与仅使用铝阴极的器件相比，插入薄的LiF层可使器件效率提高50倍，并且消除了对电子传输层的需求，例如三（8-羟基喹啉）铝。这使得器件具有优异的颜色纯度，发射峰为476 nm，全宽度为78 nm。通过紫外光电子能谱分析，发现铝的有效功函数随着表面LiF的亚单层沉积量的增加而显著降低。(C) 1998美国物理研究所。[s0021 - 8979(98) 05816 - 2]。
We report a two-layer, blue organic light-emitting diode with a 4,4'-bis(2,2-diphenylvinyl)-1,1'-biphenyl emission layer and a LiF/Al cathode which has an external quantum efficiency of 1.4% and a maximum luminance of 3000 cd/m(2). Insertion of the thin LiF layer results in a 50-fold increase in the device efficiency compared to a device with an aluminum only cathode, and eliminates the need for an electron-transporting layer, such as tris(8-hydroxyquinoline)aluminum. This results in a device with excellent color purity with an emission peak at 476 nm and a full width at half maximum of 78 nm. Using ultraviolet photoelectron spectroscopy, we find that the effective work-function of aluminum decreases dramatically with sub-monolayer amounts of LiF deposited on the surface. (C) 1998 American Institute of Physics. [S0021-8979(98)05816-2].