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

Im, Woo-Bin; Hwang, Ha-Keun; Lee, Jae-Gyoung; Han, Kijong; Kim, Youngkyoo
August 2001
Applied Physics Letters;8/27/2001, Vol. 79 Issue 9, p1387
Academic Journal
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 ∼5.82 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[sup 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. © 2001 American Institute of Physics.


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