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

Citation
Wb. Im et al., Bright pure blue emission from multilayer organic electroluminescent device with purified unidentate organometallic complex, APPL PHYS L, 79(9), 2001, pp. 1387-1389
Citations number
18
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Apllied Physucs/Condensed Matter/Materiales Science
Journal title
APPLIED PHYSICS LETTERS
ISSN journal
0003-6951 → ACNP
Volume
79
Issue
9
Year of publication
2001
Pages
1387 - 1389
Database
ISI
SICI code
0003-6951(20010827)79:9<1387:BPBEFM>2.0.ZU;2-6
Abstract
Multilayer organic electroluminescent devices (OELDs) were fabricated with highly pure 2-(2-hydroxyphenyl)benzoxazolato lithium (LiPBO), which was obt ained 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 b lue 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 sh owed stable and bright blue emission above 14 000 cd/m(2) with the color co ordinate of x=0.15 and y=0.11, even though the color purity was slightly po orer than that with only the HBL. (C) 2001 American Institute of Physics.