KMID : 1059520100540030291
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Journal of the Korean Chemical Society 2010 Volume.54 No. 3 p.291 ~ p.294
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Endothermic Forster Energy Transfer from DPVBi to BCzVBi in High Efficient Blue Organic Light-Emitting Diodes
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Kim You-Hyun
Lee Sang-Youn Song Wook Shin Sung-Sik Ryu Dae-Hyun Richard Wood Jay Yatulis Kim Woo-Young
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Abstract
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In this study, we demonstrated high-efficiency blue organic light-emitting diodes (OLEDs) employing BCzVBi as a blue fluorescent dye doped into blue host material, DPVBi with various concentration. The optimized blue OLED device having high-efficiency was constructed with structure of NPB (500 A) / DPVBi:BCzVBi-6% (150 A) / Alq3 (300 A) / Liq (20 A) / Al (1000 A). The maximum luminescence of blue OLED was 13200 cd/m2 at 13.8 V and current density and maximum efficiency were 26.4 mA/cm2 at 1000 cd/m2 and 4.24 cd/A at 3.9 V, respectively. Luminous efficiency shows two times higher than comparing with non-doped BCzVBi blue OLED whereas CIEx,y coordinate was similar with bare DPVBi blue OLED such as (0.16, 0.19). Electroluminescence of BCzVBi-6% doped blue OLED has two major peaks at 445 nm and 470 nm whereas pure DPVBi¡¯s blue peak appears at 456 nm and it is happened through endothermic Forster energy transfer by molecule¡¯s vibration between LUMO of DPVBi as host material and LUMO of BCzVBi as dopant in device.
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KEYWORD
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BCzVBi, DPVBi, OLED, DPVBi, BCzVBi, Blue emission, Foster energy transfer, High efficiency
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