blending concentrations. Compared with two or three iridium(III) complexes being contained in silica-based particles as phosphors as described in literatures, in this study, silica-based hybrid nanospheres covalently containing only one yellow-emitting cationic iridium(III) complex as phosphors provide a more effective and simpler method for preparation high-performance WLEDs.
一种发黄光的阳离子
铱( III )络合物[(dfppy) 2 Ir(TBD)]PF 6 (TBD: N 4 , N 4′ -双(3-(三乙氧基甲
硅烷基)丙基)-[2,2′-联
吡啶]合成了含有可
水解烷氧基
硅烷的-4,4'-二甲酰胺;dfppy:
2-(2,4-二氟苯基)吡啶)。然后,通过将该复合物与原
硅酸四乙酯(TEOS,
二氧化硅源)一起
水解,制备了一系列直径约为 400 nm 的
二氧化硅基杂化纳米球。当复合物的用量为5.0 wt%时,杂化纳米球表现出最好的光致发光(PL)性能,相对于纯固体[(dfppy) 2 Ir(TBD)]PF 6的PL量子产率(12.7%),即杂化纳米球的比例增加至 26.2%。此外,纯固体[(dfppy) 2 Ir(TBD)]PF 6的热分解温度( T d )为331℃,杂化纳米球中配合物的T d增加至447℃。然而,黄光发射几乎没有变化,仍然位于 500-750 nm,最大波长(