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The Strathprints institutional repository is a digital archive of University of Strathclyde research outputs.

Strathprints serves world leading Open Access research by the University of Strathclyde, including research by the Strathclyde Institute of Pharmacy and Biomedical Sciences (SIPBS), where research centres such as the Industrial Biotechnology Innovation Centre (IBioIC), the Cancer Research UK Formulation Unit, SeaBioTech and the Centre for Biophotonics are based.

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

Laurand, Nicolas and Guilhabert, Benoit Jack Eloi and Mckendry, Jonathan and Kelly, A. and Rae, B. and Massoubre, David and Gong, Zheng and Gu, Erdan and Henderson, R.K. and Dawson, Martin (2012) Colloidal quantum dot nanocomposites for visible wavelength conversion of modulated optical signals. Optical Materials, 2 (3). pp. 250-260. ISSN 0925-3467

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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 application