4,4′-Bis(2,2-diphenylvinyl)-1,1′-biphenyl (DPVBi) is a well-known blue-emitting material for electroluminescent devices, but its vacuum evaporated films exhibit a phase transition trend from amorphous to crystalline state, which impacts morphological stability and device lifetime. We rep...
4,4′-Bis(2,2-diphenylvinyl)-1,1′-biphenyl (DPVBi) is a well-known blue-emitting material for electroluminescent devices, but its vacuum evaporated films exhibit a phase transition trend from amorphous to crystalline state, which impacts morphological stability and device lifetime. We report here a cruciform DPVBi derivate, named 2,5,2′,5′-tetrakis(2,2-diphenylvinyl)biphenyl (TDPVBi), in which two 1,4-bis(2,2-diphenylvinyl)benzene segments are linked through a central biphenyl linkage. TDPVBi exhibits very high photoluminescence efficiency in the solid state (80%), and fully amorphous characteristics with high glass transition temperature (Tg = 110 °C). High performance non-doped blue organic light-emitting device (OLED) with Commission Internationale de I'Eclairage (CIE) coordinates of (0.16, 0.21), maximum luminance efficiency of 6.2 cd A−1 (corresponding external quantum efficiency of 3.8%), and maximum luminance exceeding 31 170 cd m−2 is achieved based on TDPVBi. The operation lifetime of TDPVBi-based device exhibits a 1.7-fold enhancement relative to that of a similar device based on DPVBi. Graphic Abstract2,5,2′,5′-Tetrakis(2,2-diphenylvinyl)biphenyl (TDPVBi) has been synthesized. TDPVBi exhibits high solid photoluminescence efficiency (80%), high glass transition temperature (Tg = 110 °C). The high performance non-doped blue organic light-emitting device based on TDPVBi shows the CIE coordinates, turn-on voltage, maximum efficiency and maximum luminance of (0.16, 0.21), 3.8 V, 6.2 cd A−1 and 31 170 cd m−2, respectively.
4,4′-Bis(2,2-diphenylvinyl)-1,1′-biphenyl (DPVBi) is a well-known blue-emitting material for electroluminescent devices, but its vacuum evaporated films exhibit a phase transition trend from amorphous to crystalline state, which impacts morphological stability and device lifetime. We report here a cruciform DPVBi derivate, named 2,5,2′,5′-tetrakis(2,2-diphenylvinyl)biphenyl (TDPVBi), in which two 1,4-bis(2,2-diphenylvinyl)benzene segments are linked through a central biphenyl linkage. TDPVBi exhibits very high photoluminescence efficiency in the solid state (80%), and fully amorphous characteristics with high glass transition temperature (Tg = 110 °C). High performance non-doped blue organic light-emitting device (OLED) with Commission Internationale de I'Eclairage (CIE) coordinates of (0.16, 0.21), maximum luminance efficiency of 6.2 cd A−1 (corresponding external quantum efficiency of 3.8%), and maximum luminance exceeding 31 170 cd m−2 is achieved based on TDPVBi. The operation lifetime of TDPVBi-based device exhibits a 1.7-fold enhancement relative to that of a similar device based on DPVBi. Graphic Abstract2,5,2′,5′-Tetrakis(2,2-diphenylvinyl)biphenyl (TDPVBi) has been synthesized. TDPVBi exhibits high solid photoluminescence efficiency (80%), high glass transition temperature (Tg = 110 °C). The high performance non-doped blue organic light-emitting device based on TDPVBi shows the CIE coordinates, turn-on voltage, maximum efficiency and maximum luminance of (0.16, 0.21), 3.8 V, 6.2 cd A−1 and 31 170 cd m−2, respectively.
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Appl. Phys. Lett. Hosokawa 63 1322 1993 10.1063/1.109718
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