Journal
DALTON TRANSACTIONS
Volume 50, Issue 1, Pages 311-322Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/d0dt03554h
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Funding
- National Natural Science Foundation of China [51672066, 51902080, 12004093]
- Funds for Distinguished Young Scientists of Hebei Province, China [A2018201101]
- Natural Science Foundation of Hebei Province, China [E2019201223]
- personnel training project of Hebei Province, China [A201902005]
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This study successfully synthesized a multi-functional and dual-excited near-infrared phosphor, which can emit in different ranges and is suitable for biological detection applications. The emission spectra of this phosphor are attributed to the transitions of Cr3+ and Cr4+.
Recently, near-infrared phosphors that can be applied in many fields such as night vision, agriculture, and bio-applications have attracted considerable interest in the research field worldwide. Herein, a multi-functional and dual-excited near-infrared phosphor Mg14Ge5O24:Cr3+,Cr4+ which provides two emission bands ranging from 700 nm to 1100 nm and 1100 nm to 1700 nm has been obtained via the traditional high-temperature solid state reaction. The presence of six and four coordination ions in the olivine structure of Mg14Ge5O24 provides a favorable environment for the coexistence of Cr3+ and Cr4+. Under blue light excitation, a super broad emission band ranging from 650 nm to 1100 nm with a full-width at half maximum (FWHM) of 266 nm is assigned to the spin-allowed T-4(2) (4F) -> (4)A(2) transition of Cr3+ in a weak crystal-field environment. With the increase in the concentration of Cr ions, more and more Cr4+ preferentially occupies four coordinated Ge4+ sites, and the other broad emission band ranging from 1100 nm to 1600 nm with a FWHM of 256 nm that comes from the T-3(2) -> (3)A(2) transition of Cr4+ is observed. The phenomenon of NIR I region excitation and NIR II region emission appears. The transmission experiment of a biological tissue proves that the Mg14Ge5O24:Cr3+,Cr4+ phosphor has potential applications in the field of near-infrared light-emitting diodes for biological detection.
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