An electron-transport-type host was synthesized using a benzo[4,5]furo[3,2-d]pyrimidine (BFP) core to develop a high triplet energy host. The host was designed to have both the tetraphenylsilyl blocking group and the hole-transport-type carbazole group. In the device application, the host was used as an electron-transport-type host mixed with a hole-transport-type 3,3†-di(9H-carbazol-9-yl)-1,1†-biphenyl (mCBP) host in the blue phosphorescent organic light-emitting diodes (PhO-LEDs) doped with a [[5-(1,1-dimethylethyl)-3-phenyl-1H-imidazo[4,5-b]pyrazin-1-yl-2(3H)-ylidene]-1,2-phenylene]bis-[[6-(1,1-dimethylethyl)-3-phenyl-1H-imidazo[4,5-b]pyrazin-1-yl-2(3H)-ylidene]-1,2-phenylene]iridium (Ir(cb)₃) blue phosphor. As a result, the mCBP:CzBFPmSi mixed host showed high external quantum efficiency over 20% at 1000 cd m⁻² and low efficiency roll-off in the blue PhOLEDs.

使用苯并[4,5]呋喃[3,2-d]嘧啶（BFP）核合成电子传输型主体，以开发高三重态能量主体。主体被设计成具有四苯基甲硅烷基封闭基团和空穴传输型咔唑基团。在器件应用中，主体用作与空穴传输型 3,3†-di(9H-carbazol-9-yl)-1,1†-联苯 (mCBP) 混合的电子传输型主体主体在蓝色磷光有机发光二极管 (PhO-LED) 中掺杂 [[5-(1,1-二甲基乙基)-3-苯基-1H-咪唑并[4,5-b]吡嗪-1-基- 2(3H)-亚叉基]-1,2-亚苯基]双-[[6-(1,1-二甲基乙基)-3-苯基-1H-咪唑并[4,5-b]吡嗪-1-基-2( 3H)-亚苯基]-1,2-亚苯基]铱(Ir(cb) ₃) 蓝色荧光粉。因此，mCBP:CzBFPmSi 混合主体在 1000 cd m ^-2下表现出超过 20% 的高外部量子效率，并且在蓝色 PhOLED 中表现出低效率滚降。