Journal
JOURNAL OF MATERIALS CHEMISTRY C
Volume 8, Issue 27, Pages 9322-9328Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/d0tc01951h
Keywords
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Funding
- National Natural Science Foundations of China [51972118, 51961145101, 51722202]
- Fundamental Research Funds for the Central Universities [D2190980]
- Guangzhou Science & Technology Project [202007020005]
- Guangdong Provincial Science & Technology Project [2018A050506004]
- Local Innovative and Research Teams Project of Guangdong Pearl River Talents Program [2017BT01X137]
- RFBR [19-52-80003]
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Near-infrared (NIR) phosphor-converted light-emitting diodes (pc-LEDs) have great potential in photonic, optoelectronic and biological applications, while the discovery of a broad-band NIR phosphor still remains a challenge. Here, we report a novel Cr3+-activated MgTa(2)O(6)phosphor with an asymmetrical emission band ranging from 700 to 1150 nm and a large full width at half maximum (FWHM) of 140 nm upon 460 nm blue light excitation. The broad spectrum is assigned to the overlap of two bands centered at 910 and 834 nm, which originate from the spin-allowed transition of(4)T(2)->(4)A(2)for different Cr(3+)ions located in the two six-coordinated crystallographic sites of Mg(2+)and Ta5+, respectively. The distribution of blood vessels and bones in human palm and wrist is observed with the assistance of a commercial NIR camera and a fabricated pc-LED, which demonstrates that the MgTa2O6:Cr(3+)phosphor is promising in biological applications.
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