Fluorescence via Reverse Intersystem Crossing from Higher Triplet States in a Bisanthracene Derivative.

ABSTRACT: To elucidate the high external quantum efficiency observed for organic light-emitting diodes using a bisanthracene derivative (BD1), non-radiative transition processes as well as radiative ones are discussed employing time-dependent density functional theory. It has been previously reported that the observed high external quantum efficiency of BD1 cannot be explained by the conventional thermally activated delayed fluorescence involving T₁ exciton nor triplet-triplet annihilation. The calculated off-diagonal vibronic coupling constants of BD1, which govern the non-radiative transition rates, suggest a fluorescence via higher triplets (FvHT) mechanism, which entails the conversion of a high triplet exciton generated during electrical excitation into a fluorescent singlet exciton.

SUBMITTER: Sato T 

PROVIDER: S-EPMC5500583 | biostudies-literature | 2017 Jul

REPOSITORIES: biostudies-literature