Journal
CHEMISTRY OF MATERIALS
Volume 31, Issue 14, Pages 5245-5253Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.chemmater.9b01587
Keywords
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Funding
- National Key Research and Development Program (MOST) [2017YFB0404301]
- National Natural Science Foundation of China [51832005, 5157223, 51561135015]
- Preeminence Youth Science Funds of Zhejiang Province [LR19F050001]
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The near-infrared phosphor-converted light-emitting diodes (NIR pc-LEDs) have great potential in food industry and medical fields. For applications based on NIR spectroscopy, the next generation of NIR pc-LEDs is in a high demand of a spectrum with a much broader full width at half maximum (fwhm), which triggers the discovery of novel broadband NIR phosphors. In this work, the Cr3+-doped La2MgZrO6 (LMZ) was successfully synthesized by a conventional solid-state method in a reducing atmosphere, and the double-perovskite oxide LMZ with two distorted octahedral sites finally led to an ultra-broadband Cr3+ emission centered at 825 nm with an extremely large fwhm of 210 nm and an internal quantum efficiency of similar to 58%. The experimental data and theoretical calculation confirmed that two available Cr3+ sites with different crystal field environments contributed to the broadband emission. The crystal field parameters, decay time, and temperature-dependent photoluminescence properties were investigated and discussed to further understand the luminescence of Cr3+ in LMZ:Cr. The suitability of the title NIR phosphor in multifunctional pc-LEDs was demonstrated by pumping it with blue, green, and/or red LED chips.
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