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Issue 17, 2014
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Correlation between native defects and dopants in colloidal lanthanide-doped Ga2O3 nanocrystals: a path to enhance functionality and control optical properties

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Abstract

We report the synthesis and study of the photoluminescence properties of colloidal lanthanide(III)-doped Ga2O3 nanocrystals. The Ga2O3 nanocrystal host lattice acts as a sensitizer of the Eu3+ dopant red emission arising from intra-4f orbital transitions, and concurrently exhibits a strong blue photoluminescence originating from defect-based donor–acceptor pair (DAP) recombination. The Eu3+ sensitization, enabled by the energy transfer from the nanocrystal host lattice to the dopant centers, allows for the generation of dual blue-red emission. Increasing doping concentration leads to a decrease in the donor activation energy allowing for simultaneous control of the optical and electrical properties of these multifunctional nanocrystals. Analyses of the steady-state and time-resolved photoluminescence spectra suggest that Eu3+ ions occupy at least two different sites, which were tentatively designated as the six-coordinate internal and surface-related dopants. Uniquely, both DAP and Eu3+ emissions have long lifetimes (in milliseconds), although Eu3+ luminescence has a slower decay rate. These phenomena enable a temporal modulation of the dual emission and photoluminescence chromaticity on the millisecond timescale. The generality of these findings was demonstrated by preparing Tb3+-doped Ga2O3 nanocrystals, as a blue-green dual emitter. Owing to their optical transparency, electrical properties, emission color versatility, robustness, and fabricability, colloidal lanthanide(III)-doped Ga2O3 nanocrystals are a promising class of multifunctional materials and complex phosphors.

Graphical abstract: Correlation between native defects and dopants in colloidal lanthanide-doped Ga2O3 nanocrystals: a path to enhance functionality and control optical properties

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Publication details

The article was received on 14 sep. 2013, accepted on 22 okt. 2013 and first published on 15 nóv. 2013


Article type: Paper
DOI: 10.1039/C3TC31823K
Citation: J. Mater. Chem. C, 2014,2, 3212-3222
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    Correlation between native defects and dopants in colloidal lanthanide-doped Ga2O3 nanocrystals: a path to enhance functionality and control optical properties

    T. Wang, A. Layek, I. D. Hosein, V. Chirmanov and P. V. Radovanovic, J. Mater. Chem. C, 2014, 2, 3212
    DOI: 10.1039/C3TC31823K

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