Abstract
The angle, wavelength, and thickness dependent fluorescence emission of a luminescent film on a transparent substrate into the substrate and the air is studied theoretically by Fresnel type transmittance calculations for s- (TE) and p- (TM) polarised emission. A micro-cavity behaviour due to Fabry–Perot like constructive and destructive interference is observed. The Fabry–Perot like interference strongly modifies the grazing-angle in-substrate spontaneous emission spectrum compared to the normal-incidence spontaneous emission. The wavelength selective constructive leaky-mode emission allows the determination of the refractive indices of luminescent thin films for TE and TM polarised light. Sub-laser-threshold grazing-angle in-substrate emission is analysed for molecular 4-methyl-TPD and polymeric TPD(4M)-MEH-P-PPV thin films.
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