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Spectral dependence of intermolecular distance in organic semiconductors based on FRET theory

FAN KONG1,*

Affiliation

  1. School of Chemistry and Chemical Engineering, Southeast University, Nanjing 211189, People’s Republic of China

Abstract

The optical properties of N,N’-Diphenyl-N,N’-bis(3-methylphenyl)benzidine (TPD) films doped with tris(8-hydroxyquinoline)aluminum (Alq3) were studied using absorption and photoluminescence (PL) spectroscopy. A significant spectral overlap between TPD and Alq3 was observed, which facilitates efficient excitation energy transfer from TPD to Alq3. Analysis of the PL and PL excitation spectra indicates that the resonant energy transfer is responsible for the high luminescence efficiency of Alq3 in the hybrid films. Furthermore, the average distance between the donor and acceptor exhibits a linear dependence on the doping concentration, which provides a convenient spectral ruler for exploring intermolecular distances in hybrid semiconductors.

Keywords

Organic semiconductors, Photoluminescence, Förster resonance energy transfer, 8-Hydroxyquinoline.

Citation

FAN KONG, Spectral dependence of intermolecular distance in organic semiconductors based on FRET theory, Optoelectronics and Advanced Materials - Rapid Communications, 19, 11-12, November-December 2025, pp.544-548 (2025).

Submitted at: May 16, 2025

Accepted at: Dec. 2, 2025