Energy-transfer-induced enhancement of Mn2+-based narrow-band green emission in Sr2(Mg,Mn)Al22O36 phosphor by Eu2+ alloying
| Autor: | Xinguo Zhang, Zishan Sun, Jiaobao Luo, Tingting Zhang, Chunyan Zhou, Aihua He |
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| Rok vydání: | 2020 |
| Předmět: |
Materials science
Process Chemistry and Technology Doping Analytical chemistry Phosphor Backlight Emission intensity Surfaces Coatings and Films Electronic Optical and Magnetic Materials law.invention Full width at half maximum law Materials Chemistry Ceramics and Composites Luminescence Intensity (heat transfer) Light-emitting diode |
| Zdroj: | Ceramics International. 46:28268-28276 |
| ISSN: | 0272-8842 |
| Popis: | A high-purity green-emitting Sr2(Mg,Mn)Al22O36 solid-solution phosphor and its partial doped compound (Sr2(Mg,Mn)Al22O36: Eu2+) were synthesized via solid-state reaction. This solid-solution phosphor shows a green band at 518 nm from Mn2+ instinct 4T1-6A1 transition with a narrow FWHM of 28 nm. This green emission is of high color purity (87.7%) and thermal stable (80% of original intensity at 473 K). However, the emission intensity requires further enhancement due to the limitation of Mn2+ 3d-3d forbidden transition. With a tiny amount of Eu2+ introduced into Sr2(Mg,Mn)Al22O36, the luminescence intensity enormously improved to 260% of that in blank sample due to high-efficient Eu2+-Mn2+ energy transfer, which is induced by a structural confinement effect with Eu2+-Mn2+ distance of 6.225 A. Thus, the EQE of optimal phosphor Sr2Mg0.2Mn0.8Al22O36: 0.01Eu2+ is boosted to 42%. The above results hint that Sr2(Mg,Mn)Al22O36: Eu2+ has promising application potential as a green phosphor for backlighting LEDs in wide-color-gamut display, and this sensitized strategy could be applied for the development of high-performance phosphors. |
| Databáze: | OpenAIRE |
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