Optical Characterization of Organic Light-Emitting Thin Films in the Ultraviolet and Visible Spectral Ranges

TL;DR

This paper presents a method to correct spectrophotometric measurements of organic light-emitting thin films, addressing challenges caused by broad-band luminescence interfering with optical transmittance and reflectance data.

Contribution

The authors develop a novel correction technique for photometric spectra affected by photoluminescence in organic light-emitting thin films.

Findings

Effective correction of photoluminescence perturbation demonstrated

Improved accuracy in optical transmittance and reflectance measurements

Method applicable to high-efficiency organic optoelectronic samples

Abstract

The spectrophotometric characterization of high efficiency, optically-active samples such as light-emitting organic bulks and thin films can be problematic because their broad-band luminescence is detected together with the monochromatic transmitted and reflected signals, hence perturbing measurements of optical transmittance and reflectance at wavelengths within the photoexcitation band. As a matter of fact, most commercial spectrophotometers apply spectral filtering before the light beam reaches the sample, not after it. In this Report, we introduce and discuss the method we have developed to correct photometric spectra that are perturbed by photoluminescence.