Increased color conversion efficiency in hybrid light emitting diodes utilizing non-radiative energy transfer

TL;DR

This paper demonstrates a highly efficient color conversion in hybrid LEDs by leveraging non-radiative energy transfer between blue emitters and nanocrystal quantum dots, leading to doubled electroluminescence.

Contribution

It introduces a novel hybrid LED design that utilizes non-radiative energy transfer to significantly improve color conversion efficiency.

Findings

Increased donor emission decay rate observed

Transient carrier transfer confirmed

Electroluminescence of NQDs doubled

Abstract

We fabricate a highly efficient colour conversion light emitting diode consisting of surface-patterned blue emitters and semiconductor colloidal nanocrystal quantum dots (NQDs). Electrically injected carriers in the blue emitter (donor) are efficiently transferred to the NQDs (acceptor) via nonradiative energy transfer in addition to conventional radiative energy transfer. The existence of nonradiative energy transfer is verified by the simultaneous observation of increased donor emission decay rate, the transient transfer of carriers at the acceptor and a 2-fold enhancement of the NQD electroluminescence.