有机多层量子阱的能量转移

Energy transfer in organic quantum well structures

采用多源有机分子气相沉积系统制备了不同类型的有机多量子阱结构,利用电化学循环伏安法和吸收光谱、荧光光谱研究了量子阱的类型、光致发光的特性.电化学循环伏安法和吸收光谱的测量结果表明,PBD/8-羟基喹啉铝(Alq3)有机量子阱为Ⅰ型量子阱结构,NPB/Alq3和BCP/Alq3有机量子阱为Ⅱ型量子阱结构.荧光光谱的研究结果表明,PBD/Alq3和BCP/Alq3量子阱结构可以实现PBD,BCP向Alq3能量完全转移,而NPB/Alq3量子阱结构,NPB和Alq3之间只是部分能量转移.文中对影响能量转移的因素进行了讨论.

Different types of organic quantum well structures have been grown by organic molecular beam deposition. Energy level and optical property of the quantum well are determined by cyclic vohammetry, optical absorption and photoluminescence. Cyclic vohammetry and optical absorption results indicate that PBD/ Alq3 muhilayer can be classified as type Ⅰ , NPB/Alq3 and BCP/ Alq3 as type Ⅰ . The PL experimental results indicate that the structures of PBD/ Alq3 and BCP/ Alq3 exhibit complete energy transfer from PBD or BCP to Alq3, and the structures of NPB/Alq3 exhibit partial energy transfer from NPB to Alq3 . The reason for energy transfer in organic quantum well structures is discussed in light of the theoretical and experimental results published in the literature.