Highly Efficient Red Phosphorescent OLEDs based on Non-Conjugated Silicon-Cored Spirobifluorene Derivative Doped with Ir-Complexes
作者： Yi‐Yeol Lyu , Jeonghun Kwak , Woo Sung Jeon , Younghun Byun , Hyo Sug Lee
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摘要: A novel host material containing silicon-cored spirobifluorene derivative (SBP-TS-PSB), is designed, synthesized, and characterized for red phosphorescent organic light-emitting diodes (OLEDs). The SBP-TS-PSB has excellent thermal morphological stabilities exhibits high electroluminescence (EL) efficiency as a the OLEDs. electrophosphorescence properties of devices using iridium (III) complexes emitter are investigated these exhibit higher EL performances compared with reference 4,4′-N,N′-dicarbazole-biphenyl (CBP) material; example, (piq)2Ir(acac)-doped device shows maximum external quantum ηext = 14.6%, power 10.3 lm W−1 Commission International de L'Eclairage color coordinates (0.68, 0.32) at J = 1.5 mA cm−2, while CBP ηext = 12.1%. These can be mainly explained by efficient triplet energy transfer from to guests improved charge balance attributable bipolar characteristics group.
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