Haseyama Shota, Niwa Akitsugu, Kobayashi Takashi, Nagase Takashi, Goushi Kenichi, Adachi Chihaya, Naito Hiroyoshi
Department of Physics and Electronics, Osaka Prefecture University, 1-1 Gakuencho, Naka, Sakai, 599-8531, Japan.
Research Institute of Molecular Electronic Devices (RIMED), Osaka Prefecture University, 1-1 Gakuencho, Naka, Sakai, 599-8531, Japan.
Nanoscale Res Lett. 2017 Dec;12(1):268. doi: 10.1186/s11671-017-2012-1. Epub 2017 Apr 11.
The photoluminescence properties of a thermally activated delayed fluorescence emitter, 1,2-bis(carbazol-9-yl)-4,5-dicyanobenzene (2CzPN), doped in a host matrix consisting of 1,3-bis(9-carbazolyl)benzene and a polar inert molecule, camphoric anhydride (CA), in various concentrations have been investigated. It is found that the addition of CA stabilizes only the lowest singlet excited state (S) of 2CzPN without changing the energy level of the lowest triplet excited state (T), leading to a reduction in the energy gap between S and T. The maximum reduction of energy gap achieved in this work has been determined to be around 65 meV from the shift of the fluorescence spectrum and the temperature dependence of the photoluminescence decay rate.
研究了热激活延迟荧光发射体1,2-双（咔唑-9-基）-4,5-二氰基苯（2CzPN）掺杂在由1,3-双（9-咔唑基）苯和极性惰性分子樟脑酸酐（CA）组成的主体基质中，不同浓度下的光致发光特性。研究发现，CA的加入仅稳定了2CzPN的最低单重激发态（S），而不改变最低三重激发态（T）的能级，导致S和T之间的能隙减小。根据荧光光谱的位移和光致发光衰减率的温度依赖性，确定这项工作中实现的能隙最大减小约为65毫电子伏特。
