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

Im, WB Hwang, HK Lee, JG Han, K Kim, Y

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

18

INGLESE

Article

Apllied Physucs/Condensed Matter/Materiales Science

APPLIED PHYSICS LETTERS

0003-6951 → ACNP

79

9

2001

1387 - 1389

ISI

0003-6951(20010827)79:9<1387:BPBEFM>2.0.ZU;2-6

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.