Rai, Virendra Kumar and Srivastava, Ritu and Kamalasanan, M. N. (2009) White organic electroluminescence from fluorescent bis (2-(2-hydroxyphenyl) benzoxazolate)zinc doped with phosphorescent material. Journal of Luminescence , 130 (2). pp. 249-253. ISSN 0022-2313

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Abstract

Efficient white electroluminescence has been obtained by using an electroluminescent layer comprising of a blue fluorescent bis (2-(2-hydroxyphenyl) benzoxazolate)zinc [Zn(hpb)2] doped with red phosphorescent bis (2-(2′-benzothienyl) pyridinato-N,C3′)iridium(acetylacetonate) [Ir(btp)2acac] molecules. The color coordinates of the white emission spectrum was controlled by optimizing the concentration of red dopant in the blue fluorescent emissive layer. Organic light-emitting diodes were fabricated in the configuration ITO/α-NPD/Zn(hpb)2:0.01 wt%Ir(btp)2acac/BCP/Alq3/LiF/Al. The J–V–L characteristic of the device shows a turn on voltage of 5 V. The electroluminescence (EL) spectra of the device cover a wide range of visible region of the electromagnetic spectrum with three peaks around 450, 485 and 610 nm. A maximum white luminance of 3500 cd/m2 with CIE coordinates of (x, y=0.34, 0.27) at 15 V has been achieved. The maximum current efficiency and power efficiency of the device was 5.2 cd/A and 1.43 lm/W respectively at 11.5 V.

Item Type:	Article
Additional Information:	Copyright for this article belongs to M/s Elsevier B.V.
Subjects:	Optics
Divisions:	UNSPECIFIED
Depositing User:	Ms Neetu Chandra
Date Deposited:	08 Aug 2012 10:57
Last Modified:	08 Aug 2012 10:57
URI:	http://npl.csircentral.net/id/eprint/391

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