Pump-power-dependence of CsPbBr₃-in-Cs₄PbBr₆ quantum dot color converter

Leitao, M. F. et al. (2019) Pump-power-dependence of CsPbBr₃-in-Cs₄PbBr₆ quantum dot color converter. Optical Materials Express, 9(8), pp. 3504-3518. (doi: 10.1364/OME.9.003504)

191360.pdf - Published Version
Available under License Creative Commons Attribution.



A detailed study of the pump-intensity dependent characteristics of an all-inorganic CsPbBr3-in-Cs4PbBr6 quantum dot (QD) color converter are reported. This is an attractive material to color convert UV/blue GaN optical pump sources for digital lighting applications, e.g. visible light communications (VLC). It demonstrates narrow spectral emission (522 nm peak emission and < 20 nm full-width-at-half-maximum), invariant with the pump power density (from 0 to 7.15 kW/cm2). The optical bandwidth increases, from 10 MHz at 300 µW/cm2, up to 22 MHz at 3 W/cm2, and 41 MHz at 7.15 kW/cm2. This acceleration of the emission is ascribed to both an increase of the radiative decay rate in the low-pump-density regime, and to the emergence of non-radiative pathways at higher pump density. The higher bandwidth at high-pump density enables a 30% increase in the data rate of a free space VLC link using this color converter.

Item Type:Articles
Additional Information:Funding: Engineering and Physical Sciences Research Council (EPSRC) (EP/K00042X/1, EP/P0274X/2).
Glasgow Author(s) Enlighten ID:Viola, Mr Shaun and Watson, Dr Scott and Kelly, Professor Anthony
Authors: Leitao, M. F., Islim, M.S., Yin, L., Viola, S., Watson, S., Kelly, A., Dong, Y., Li, X., Zheng, H., Videv, S., Haas, H., Gu, E., Watson, I.M., Laurand, N., and Dawson, M.D.
College/School:College of Science and Engineering > School of Engineering > Electronics and Nanoscale Engineering
Journal Name:Optical Materials Express
Publisher:Optical Society of America
ISSN (Online):2159-3930
Copyright Holders:Copyright © 2019 Journal
First Published:First published in Optical Materials Express 9:3504-3518
Publisher Policy:Reproduced under a Creative Commons License

University Staff: Request a correction | Enlighten Editors: Update this record