Triplet exciton caging in two dimensions
Triplet exciton caging in two dimensions
复制标题
二维三重态激子笼
DOI：
--
复制
发表时间：
1976
期刊：
影响因子：
--
通讯作者：
C. Swenberg
中科院分区：
文献类型：
--
作者：
S. Arnold;R. Alfano;M. Pope;W. Yu;P. Ho;R. Selsby;J. Tharrats;C. Swenberg
有人提出，双分子过程的三重态激子融合形成单重态激子可以通过减少域的大小，其中的三重态激子对是自由移动。当主体材料是高度各向异性的时，这些小域或激子笼更加有效，并且三重态激子被限制在一维或二维中移动。在本情况下，主体材料是并四苯晶体，其中三重态激子扩散基本上是二维的。激子笼化是通过引入相对高浓度的客体分子来产生的，该客体分子可以反射三重态激子而不是捕获它;在本例中，使用2，3-苯并咔唑（BC）。制备了BC在并四苯中的多晶混合物，其摩尔分数范围为0%-50%。在并四苯中，第一激发单重态的衰变模式是通过裂变成两个相邻的三重态激子，其可以经历成对复合。BC的引入增加了聚合泰特。
It is proposed that the bimolecular process of triplet exciton fusion to form singlet excitons can be enhanced by reducing the size of the domain in which the triplet exciton pair is free to move. These small domains, or exciton cages, are much more effective when the host material is highly anisotropic, and the triplet excitons are constrained to move in one or two dimensions. In the present case, the host material is tetracene crystal in which triplet exciton diffusion is essentially two dimensional. The exciton caging is produced by introducing relatively high concentrations of a guest molecule that can reflect the triplet exciton rather than trap it; in the present case, 2,3‐benzocarbazole (BC) is used. Polycrystalline mixtures of BC in tetracene were prepared in the mol fraction range 0%–50%. In tetracene, the mode of decay of the first excited singlet state is by fission into two neighboring triplet excitons that can undergo geminate recombination. The introduction of BC is found to increase the tet...