Abstract
We have fabricated the white organic light-emitting devices (WOLEDs) based on 4,4′-bis(2,2-diphenyl vinyl)-1,1′ — biphenyl (DPVBi) and phosphorescence sensitized 5,6,11,12,-tetraphenylnaphthacene (rubrene). The device structure is ITO/2T-NATA (20 nm)/ NPBX (20 nm)/ CBP: x%Ir(ppy)3:0.5% rubrene (8 nm)/ NPBX (5 nm)/DPVBi (30 nm)/ Alq(30 nm)/LiF(0.5 nm)/Al. In the devices, DPVBi acts as a blue light-emitting layer, the rubrene is sensitized by a phosphorescent material, fac tris (2-phenylpyridine) iridium [Ir(ppy)3], acts as a yellow light-emitting layer, and N,N′-bis-(1-naphthyl)-N,N′-diphenyl-1, 1′-biphenyl-4,4′-diamine (NPBX) acts as a hole transporting and exciton blocker layer, respectively. When the concentration of Ir (ppy)3 is 6wt%, the maximum luminance is 24960 cd/m2 at an applied voltage of 15 V, and the maximum luminous efficiency is 5.17 cd/A at an applied voltage of 8 V.
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This work was supported by the Ministry of Science and Technology of Jilin under Grant No. 20050523, the Grant for the Scientific Research from the educational office of Jilin (Project No.25, [2003]; 54, [2004]) and the Grant from the department of Science and Technology of Siping [Project No.2005007; 2006008]
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Ding, Gy., Wang, J., Jiang, Wl. et al. White organic light-emitting devices based on fac tris(2-phenylpyridine) iridium sensitized 5,6,11,12-tetraphenylnap-hthacene. Optoelectron. Lett. 4, 205–208 (2008). https://doi.org/10.1007/s11801-008-7150-3
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DOI: https://doi.org/10.1007/s11801-008-7150-3