Tuning the emission color of organic semiconductor films with cholesteric liquid crystals

This paper reports on the color-tunable emission from organic semiconductor films composed of Alq doped with DCM. The composite system was excited using an ultraviolet laser to enable the emission of light from green to red regions of the visible spectra based on the nonradiative Förster transfer me...

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Bibliographic Details
Published in:Optics express 2017-05, Vol.25 (10), p.11211-11216
Main Authors: Yeh, Hui-Chen, Hsieh, Meng-Che
Format: Article
Language:English
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Summary:This paper reports on the color-tunable emission from organic semiconductor films composed of Alq doped with DCM. The composite system was excited using an ultraviolet laser to enable the emission of light from green to red regions of the visible spectra based on the nonradiative Förster transfer mechanism. A cholesteric liquid crystal film was used as a blue emitter, while simultaneously serving as a temperature-controlled optical filter based on Bragg reflection to tune the emission color of the organic semiconductor films. The corresponding color points on the CIE chromaticity diagram located near the black-body locus exhibited a wide color-tuning range within a narrow temperature range.
ISSN:1094-4087
1094-4087
DOI:10.1364/OE.25.011211