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[Zn-Ge] co-substitutes [Ga-Ga] to coordinately broaden the near-infrared emission of Cr in GaO phosphors. | LitMetric

[Zn-Ge] co-substitutes [Ga-Ga] to coordinately broaden the near-infrared emission of Cr in GaO phosphors.

Phys Chem Chem Phys

Key Laboratory of Rare Earth Optoelectronic Materials and Devices of Zhejiang Province, Institute of Optoelectronic Materials and Devices, China Jiliang University, Hangzhou 310018, People's Republic of China.

Published: January 2023

Here, a "chemical unit co-substitution" method is used to improve the near-infrared (NIR) emission of phosphors, using [Zn-Ge] to co-substitute [Ga-Ga] sites to reduce crystal field splitting to affect the structure of gallium oxide. A series of broadband NIR phosphors are synthesized by a high-temperature solid-phase method, and their phase structures, crystal structures, morphologies, diffuse reflectance spectra, and luminescence lifetimes are investigated. The Ga(Zn-Ge)O:0.02Cr (GZGOC) phosphor exhibits NIR wide-band emission, with a peak wavelength of 766 nm and a half-width of 138 nm. Meanwhile, the quantum yield of photoluminescence can reach 81.2%. The phosphor has good thermal stability. When the temperature reaches 373 K, its emission intensity still remains at 73.4% of that at room temperature. A 460 nm LED chip and this phosphor are used to fabricate a phosphor-converted light emitting diode (pc-LED) device which can be used as a NIR light source. All these results show the application potential of the as-prepared phosphor in NIR imaging.

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Source
http://dx.doi.org/10.1039/d2cp04737cDOI Listing

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