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A dual-excited and dual near-infrared emission phosphor Mg14Ge5O24:Cr3+,Cr4+ with a super broad band for biological detection.
- Source :
- Dalton Transactions: An International Journal of Inorganic Chemistry; 1/7/2021, Vol. 50 Issue 1, p311-322, 12p
- Publication Year :
- 2021
-
Abstract
- 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 Mg<subscript>14</subscript>Ge<subscript>5</subscript>O<subscript>24</subscript>:Cr<superscript>3+</superscript>,Cr<superscript>4+</superscript> 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 Mg<subscript>14</subscript>Ge<subscript>5</subscript>O<subscript>24</subscript> provides a favorable environment for the coexistence of Cr<superscript>3+</superscript> and Cr<superscript>4+</superscript>. 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 <superscript>4</superscript>T<subscript>2</subscript> (4F) → <superscript>4</superscript>A<subscript>2</subscript> transition of Cr<superscript>3+</superscript> in a weak crystal-field environment. With the increase in the concentration of Cr ions, more and more Cr<superscript>4+</superscript> preferentially occupies four coordinated Ge<superscript>4+</superscript> sites, and the other broad emission band ranging from 1100 nm to 1600 nm with a FWHM of 256 nm that comes from the <superscript>3</superscript>T<subscript>2</subscript> → <superscript>3</superscript>A<subscript>2</subscript> transition of Cr<superscript>4+</superscript> 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 Mg<subscript>14</subscript>Ge<subscript>5</subscript>O<subscript>24</subscript>:Cr<superscript>3+</superscript>,Cr<superscript>4+</superscript> phosphor has potential applications in the field of near-infrared light-emitting diodes for biological detection. [ABSTRACT FROM AUTHOR]
- Subjects :
- IONIC structure
NIGHT vision
VISUAL fields
LIGHT emitting diodes
BLUE light
PHOSPHORS
Subjects
Details
- Language :
- English
- ISSN :
- 14779226
- Volume :
- 50
- Issue :
- 1
- Database :
- Complementary Index
- Journal :
- Dalton Transactions: An International Journal of Inorganic Chemistry
- Publication Type :
- Academic Journal
- Accession number :
- 147927601
- Full Text :
- https://doi.org/10.1039/d0dt03554h