A series of solution processable, wide band-gap host materials composed of carbazole and tetraphenylsilane groups were designed and synthesized. Their thermal, electrochemical, and photophysical properties were fully investigated. The introduction of bulky tetraphenylsilane and \textittert}-butyl groups around the carbazole led to high glass transition temperatures (T$_g})$ between 120 and 204 $^\circ}$C. The triplet energies (E$_T})$ of the synthesized materials were examined by low temperature (77 K) photoluminescence studies and determined as E$_T}>$ 2.6 for all compounds. Phosphorescent organic light-emitting devices with the ITO/PEDOT:PSS/EML/TPBi/Cs$_2}$CO$_3}$/Al device structure were fabricated by using synthesized materials as the host and two kinds of phosphorescent emitters, FIrpic and Ir(ppy)$_3}$, as the guests. The highest luminous and power efficiency values obtained by using FIrpic were 3.6 cd A$^-1}$ and 1.48 lm W$^-1}$, respectively, with commission International de I'Eclairage (CIE) coordinates of (0.17, 0.36), whereas these values were 7.8 cd A$^-1}$ and 2.9 lm W$^-1}$ for the device structure when Ir(ppy)$_3}$ was used as the guest [CIE (0.28, 0.62)].
设计并合成了一系列由
咔唑和四
苯基
硅烷基团组成的可溶液加工的宽带隙宿主材料。对它们的热学、电
化学和光物理性质进行了全面研究。在
咔唑周围引入笨重的四
苯基
硅烷和(textittert}-丁基)基团后,
玻璃化转变温度(T$_g})$ 在 120 到 204 $^\circ}$C 之间。通过低温(77 K)光致发光研究检测了合成材料的三重能(E$_T})$,并确定所有化合物的 E$_T}>$ 均为 2.6。以合成材料为宿主,FIrpic 和 Ir(ppy)$_3}$ 两种
磷光发光体为客体,制备了具有 ITO/P
EDOT:
PSS/
EML/TPBi/Cs$_2}$CO$_3}$/Al 器件结构的
磷光有机发光器件。使用 FIrpic 获得的最高光效和功率效率值分别为 3.6 cd A$^-1}$ 和 1.48 lm W$^-1}$,国际照明委员会(CIE)坐标为 (0. 17, 0.36)。而在使用 Ir(ppy)$_3}$ 作为客体[CIE (0.28, 0.62)]时,器件结构的这两个值分别为 7.8 cd A$^-1}$ 和 2.9 lm W$^-1}$。]