Pump-power-dependence of a CsPbBr 3-in-Cs 4PbBr 6 quantum dot color converter

Leitão, Miguel F. and Islim, M. S. and Yin, L. and Viola, S. and Watson, S. and Kelly, A. and Dong, Y. and Li, X. and Zeng, H. and Videv, S. and Haas, H. and Gu, E. and Watson, I. M. and Laurand, N. and Dawson, M. D. (2019) Pump-power-dependence of a CsPbBr 3-in-Cs 4PbBr 6 quantum dot color converter. Optical Materials Express, 9 (8). pp. 3504-3518. ISSN 2159-3930

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    Abstract

    A detailed study of the pump-intensity dependent characteristics of an all-inorganic CsPbBr 3-in-Cs 4PbBr 6 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/cm 2). The optical bandwidth increases, from 10MHz at 300 μW/cm 2, up to 22MHz at 3 W/cm 2, and 41MHz at 7.15 kW/cm 2. 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.