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Electroluminescent properties of OLEDs using 1,2-BBPE derivatives

Authors
Youn, SWRyu, GYShin, DM
Issue Date
Dec-2004
Publisher
WORLD SCIENTIFIC PUBL CO PTE LTD
Keywords
organic electroluminescence; blue emitter; stilbene derivatives
Citation
JOURNAL OF NONLINEAR OPTICAL PHYSICS & MATERIALS, v.13, no.3-4, pp.601 - 606
Journal Title
JOURNAL OF NONLINEAR OPTICAL PHYSICS & MATERIALS
Volume
13
Number
3-4
Start Page
601
End Page
606
URI
https://scholarworks.bwise.kr/hongik/handle/2020.sw.hongik/25713
DOI
10.1142/S0218863504002353
ISSN
0218-8635
Abstract
We fabricated the organic light emitting diodes (OLEDs) using 1,2-BBPE (1,2-bisbiphenyl ethene) derivatives as a blue emitting material, which was synthesized from the 4,4'-dibromo stilbene. The methyl and tert-butyl groups were incorporated at the 4" and 4''' positions of 1,2-BBPE: 1,2-bis(4",4"'-dimethylbiphenyl)ethene (BMBPE) and 1,2-bis(4",4"-di-tert-butylbiphenyl)ethene (BTBBPE). Photo-luminescence (PL) maxima were 439 nm for BMBPE and 425 nm for BTBBPE deposited as a film with the thickness of 1000 A. The single-layer device fabricated with BMBPE exhibited electroluminescent (EL) maxima at 440 and 422 mn. The brightness of the luminescence observed from the device was 50 cd under 19 V. The FWHM (full-width half-maximum) observed from the EL device was 55 m. The luminescence intensity generated from the OLED made with a single BBPE layer emitted low intensity light at 422 and 442 nm and the FWHM was 61 nm. The multi-layer device with NPB, Alq(3), BCP for the hole blocking layer and BTBBPE as emission material showed luminescence intensity over 2000 Cd/m(2). We investigated the luminescence property as a function of device structure, such as layer thickness, chemical structure dependence.
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