Highly efficient blue fluorescent OLEDs with doped double emitting layers based on p–n heterojunctions

doi:10.1088/1674-1056/21/5/058503

Abstract We fabricate a kind of novel efficient blue fluorescent organic light emitting device (OLED) based on p--n heterojunctions composed of hole transporting layer (HTL) $N$,$N^\prime$-bis(naphthalen-1-yl)-$N$,$N^\prime$-bis(phenyl)-benzidine (NPB) and electron transporting layer (ETL) 4,7-diphnenyl-1,10-phenanthroline (BPhen), into which a new blue material, DNCA (a derivation of N⁶, N⁶, N¹², N¹²-tetrap-tolylchrysene-6,12-diamine), is partially doped simultaneously, and double emitting layers are configured. With a turn-on voltage of 2.6 V at 1 cd/m², this type of OLED presents a maximum luminance efficiency (η_max) of 8.83 cd/A at 5.818 mA/cm² and a maximum luminance of over 40000 cd/m². Meanwhile, the Commission Internationale De L'Eclairage (CIE) coordinates of this device change slightly from (0.13, 0.27) to (0.13, 0.23) as the driving voltage increases from 3 V to 11 V. This improvement in the electroluminescent characteristics is attributed mainly to the ideal p--n heterojunction which can confine and distribute excitons evenly on two sides of the heterojunction interface so as to improve the carrier combination rate and expand the light-emitting region.

Keywords: heterojunction organic light-emitting diodes exciplex emission double emitting layers

Received: 14 September 2011
Revised: 27 April 2012
Accepted manuscript online:

PACS:	85.60.Bt	(Optoelectronic device characterization, design, and modeling)
	85.60.Jb	(Light-emitting devices)
	78.60.Fi	(Electroluminescence)

Fund: Project supported by the National Natural Science Foundation of China (Grant Nos. 60906022 and 60876046) and the Tianjin Natural Science Foundation, China (Grant No. 10JCYBJC01100).

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Su Yue-Ju(苏跃举), Wu Xiao-Ming(吴晓明), Hua Yu-Lin(华玉林), Shen Li-Ying(申利莹), Jiao Zhi-Qiang(焦志强), Dong Mu-Sen(董木森), and Yin Shou-Gen(印寿根) Highly efficient blue fluorescent OLEDs with doped double emitting layers based on p–n heterojunctions 2012 Chin. Phys. B 21 058503

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Highly efficient blue fluorescent OLEDs with doped double emitting layers based on p–n heterojunctions

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