High efficient white organic light-emitting diodes using BCzVBi as blue fluorescent dopant

You-Hyun Kim, Su-Hwan Lee, Hyun-Soo Yoon, Jae-Yoon Choi, Sung Sik Shin, Soo Joh Chae, Ji-Hoon Seo, Ji-Hyun Seo, Young-Kwan Kim, Woo-Young Kim
Journal of Nanoscience and Nanotechnology 2008, 8 (9): 4579-83
Efficiency improvement and color optimization of white organic light-emitting diodes (WOLEDs) were achieved via employing blue host DPVBi doped with blue fluorescent, BCzVBi. The structure of high efficient WOLED device was composed of ITO/NPB/DPVBi:BCzVBi-6%/MADN:DCM2-0.5%/Bphen/Liq/Al. WOLED doped by blue fluorescent BCzVBi exhibits 6.19 cd/A of luminous efficiency and 15400 cd/m2 of maximum luminescence. It also performs 480 cd/m2 of luminance at 5.7 V and 15400 cd/m2 at 12.9 V with CIE(x,y) coordinates of (0.33, 0.32) and (0.32, 0.32), respectively. Hole carrier and energy transfer from DPVBi to BCzVBi are proposed to explain the observed phenomena.

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