Colloidal quantum dot nanocomposites for visible wavelength conversion of modulated optical signals

N. Laurand, B. Guilhabert, J. McKendry, A. Kelly, Bruce R. Rae, D. Massoubre, Z. Gong, E. Gu, Robert Henderson, M. D. Dawson

Research output: Contribution to journalArticlepeer-review

Abstract

We report on the steady-state and optical modulation
characteristics of a luminescence down-converting colloidal quantum
dot/polyimide nanocomposite system suitable for integration with gallium
nitride optoelectronics. The approach provides solution-processable and
environmentally stable composite materials whose optical conversion and
intrinsic modulation properties were evaluated at wavelengths from 535 to
624 nm. A nanocomposite for white-light generation upon excitation and
mixing with 450-nm light was also obtained by blending colloidal quantum
dots of different sizes in the same matrix. The forward external quantum
efficiencies of the resulting nanocomposites were found to depend on the
wavelength and can be as high as 33%. Optical modulation bandwidth
above 25 MHz, which is an order of magnitude higher than for typical
phosphor-based color-converters for GaN LEDs, and wavelength-converted
data with an open-eye diagram at 25 Mb/s are demonstrated under external
gallium nitride light-emitting diode excitation. These modulation
characteristics are correlated with carrier lifetimes. This work provides
guideline parameters and creates a possible path to integrated hybrid visible
light sources for scientific and communications applications.
Original languageEnglish
Pages (from-to)250-260
Number of pages11
JournalOptical Materials Express
Volume2
Issue number3
DOIs
Publication statusPublished - 1 Mar 2012

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