Berlin 2018 – scientific programme

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HL: Fachverband Halbleiterphysik

HL 52: Optical properties & Photonic crystals

HL 52.9: Talk

Friday, March 16, 2018, 11:45–12:00, EW 201

Radiative versus non-radiative color conversion in an InGaN/polymer hybrid material system — •Niklas Mutz, Emil J. W. List-Kratochvil, and Sylke Blumstengel — Hybrid Devices Group, Institut für Physik, Institut für Chemie und IRIS Adlershof, Humboldt-Universität zu Berlin

White light generation in InGaN/GaN based light-emitting diodes (LEDs) is commonly achieved by so called external color conversion, where blue light emitted from an InGaN quantum well (QW) is subsequently partially absorbed by an inorganic phosphor material and reemitted in the yellow-orange spectral region to yield white light. In this process, the overall yield of converted photons is limited by the product of the quantum yield of the involved constituents. As an alternative, more efficient process, non-radiative Förster-like energy transfer from the inorganic QW to an organic acceptor can be used for the color conversion.

Here we investigate energy transfer from an InGaN/GaN single QW to a thin top layer of a light-emitting polymer, a cyano-ether-poly(p-phenylen-vinylen) (Cn-ether-PPV). We experimentally find that Cn-ether-PPV can be efficiently excited through the InGaN/GaN single QW when the organic polymer layer is in close proximity to the InGaN/GaN single QW. By means of time-resolved and -integrated photoluminescence spectroscopy at various temperatures we quantify the contribution of radiative and non-radiative energy transfer to the color conversion observed in this hybrid material system.