White emission from organic and inorganic dyes dispersed polymers excited by GaN blue LEDs

Jacques Tardy; Laurent Berthelot

doi:10.1117/12.372735

17 December 1999 White emission from organic and inorganic dyes dispersed polymers excited by GaN blue LEDs

Jacques Tardy, Laurent Berthelot

Proceedings Volume 3797, Organic Light-Emitting Materials and Devices III; (1999) https://doi.org/10.1117/12.372735
Event: SPIE's International Symposium on Optical Science, Engineering, and Instrumentation, 1999, Denver, CO, United States

Abstract

This work reports on color controlled light converters fabricated from organic dyes (coumarin, DCM) and luminescent organic (Alq₃) and inorganic (SrGa₂S₄:Eu⁺⁺) molecules dispersed in a transparent polymer host matrix. These blends were pumped with a commercial GaN blue LED having a peak emission at 430 nm. First are reported the photoluminescence spectra of Alq₃- DCM and coumarin-SrGa₂S₄:Eu⁺⁺-DCM blends. By photoexcitation of these blends with GaN blue LEDs (which is partially absorbed by the dispersed dyes), it has been observed that the color can be tuned from blue to red depending on the composition. In particular, very pure white emitting hybridLEDs could have been obtained with organic- inorganic blends. Observed luminescence is due to cascade light absorption and emission from the various dyes in the blend. The influence of the polymer host matrix on the emitted color was also evidenced. Our results show how multicolor and white emitters could be fabricated with commercially available organic materials and rare earth doped inorganic dyes.

Citation Download Citation

Jacques Tardy and Laurent Berthelot "White emission from organic and inorganic dyes dispersed polymers excited by GaN blue LEDs", Proc. SPIE 3797, Organic Light-Emitting Materials and Devices III, (17 December 1999); https://doi.org/10.1117/12.372735

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