Extent and Changeable Rule of HOMO and LUMO Energy of Organic Semiconductors in Nonequilibrium States and a Phenomenological Understanding for the Formation of “Hot Excitons” in OLED

doi:10.7503/cjcu20210856

Abstract

Abstract:

Based on Nernst equation， the change of electrode potential of organic semiconductor materials was calculated through the relationship between current density and redox species activity， i.e.， the change of carrier concentration， so as to establish the mathematical relationship between the energy displacement of their front-line orbit， the highest occupied molecular orbital（HOMO） energy level and the lowest unoccupied molecular orbital （LUMO） energy level relative to the thermodynamic equilibrium state with the current density. Moreover， through the energy gap change caused by the energy level energy displacement， the generation mechanism of thermal exciton in OLED was proposed.

Key words: Organic semiconductor, Energy level, Non-equilibrium state, Nernst equation, Hot excitons

CLC Number:

O649

TrendMD:

WANG Jianqiao, MA Yuguang. Extent and Changeable Rule of HOMO and LUMO Energy of Organic Semiconductors in Nonequilibrium States and a Phenomenological Understanding for the Formation of “Hot Excitons” in OLED[J]. Chem. J. Chinese Universities, 2022, 43(4): 20210856.

Figures/Tables 4

References 19

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