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Proceedings Paper

High-efficiency and long-lifetime fluorescent blue organic-emitting device
Author(s): Yu-Hsuan Ho; Tien-Chun Lin; Chia-Fang Wu; Jiun-Haw Lee
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Paper Abstract

In this paper, We have demonstrated a blue fluorescent organic light-emitting device (OLED) with a current efficiency of 19.2 cd/A at 100 cd/m2, an estimated half-lifetime of 15611 hours at an initial luminance of 1000 cd/m2, and a voltage of 4.9 V at 20 mA/cm2 with a high electron mobility electron transport layer (ETL) material and high efficiency dopant material. The external quantum efficiency (EQE) in this optimized OLED is 8.32%, which is very close to the theoretical limit. Carrier balance condition is achieved due to the incorporation of the high mobility ETL, bis(10- hydroxyben-zo[h]quinolinato)beryllium (Bebq2), which can not only effectively increase the current efficiency and elongate the operation lifetime, but also reduce the driving voltage and increase the power efficiency. The EML consisted of 4,4'-bis[2-(4-(N,N-diphenylamino)phenyl)vinyl]biphenyl (DPAVBi) as the blue dopant and 9,10-bis(2'- naphthyl) anthracene (ADN) as the matrix. We found that the dopant concentration of DPAVBi did not affect the mobility value of the EML which is consistent with the J-V characteristics. Besides, although it is believed the bulk ADN is a kind of HTL materials, we found the electron mobility of ADN is one order of magnitude higher than its hole mobility in our blue OLEDs.

Paper Details

Date Published: 5 December 2006
PDF: 7 pages
Proc. SPIE 6333, Organic Light Emitting Materials and Devices X, 633303 (5 December 2006); doi: 10.1117/12.678220
Show Author Affiliations
Yu-Hsuan Ho, National Taiwan Univ. (Taiwan)
Tien-Chun Lin, National Taiwan Univ. (Taiwan)
Chia-Fang Wu, National Taiwan Univ. (Taiwan)
Jiun-Haw Lee, National Taiwan Univ. (Taiwan)

Published in SPIE Proceedings Vol. 6333:
Organic Light Emitting Materials and Devices X
Zakya H. Kafafi; Franky So, Editor(s)

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