Bright pure blue emission from multilayer organic electroluminescent device with purified unidentate organometallic complex

被引:51
作者
Im, WB [1 ]
Hwang, HK [1 ]
Lee, JG [1 ]
Han, K [1 ]
Kim, Y [1 ]
机构
[1] Inst Adv Engn, NESS Ctr, Kyonggi Do 449860, South Korea
关键词
D O I
10.1063/1.1398604
中图分类号
O59 [应用物理学];
学科分类号
摘要
Multilayer organic electroluminescent devices (OELDs) were fabricated with highly pure 2-(2-hydroxyphenyl)benzoxazolato lithium (LiPBO), which was obtained through stepwise purification process, as a blue emission layer. The ionization potential of the carefully purified LiPBO was similar to5.82 eV. The multilayer OELD with a hole-blocking layer (HBL) emitted almost pure blue light with the CIE color coordinate of x=0.15 and y=0.08. However, the emission color was redshifted when an electron-transporting layer (ETL) was introduced instead of the HBL. The device with both the HBL and the ETL showed stable and bright blue emission above 14 000 cd/m(2) with the color coordinate of x=0.15 and y=0.11, even though the color purity was slightly poorer than that with only the HBL. (C) 2001 American Institute of Physics.
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页码:1387 / 1389
页数:3
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