Journal
DALTON TRANSACTIONS
Volume 45, Issue 23, Pages 9506-9512Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c6dt01594h
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Funding
- National Natural Science Foundation of China [51572200, 51102185]
- Zhejiang Province [Y16E020041]
- Public Industrial Technology Research Project of Zhejiang Province [2015C31142]
- Public Industrial Technology Research Project of Wenzhou City [G20140040]
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A green long-lasting phosphorescence (LLP) phosphor Zn2GeO4:Mn2+ (ZGOM) has been synthesized by a solid-state method at 1100 degrees C in air. The luminescence intensity has been improved up to 9 and 6 times through mixing GeO2 and MgF2 into the composition, respectively. The phosphorescence duration of the sample has been prolonged to 5 h. The phosphor, composed of a mixture of Zn2GeO4 (ZGO), GeO2, and MgGeO3 phases, emits enhanced green luminescence with a broad excitation band between 250 nm to 400 nm. Under identical measurement conditions, the optimized phosphor ZGOM has a higher emission intensity and shows longer wavelength emission than those of the commercial green LLP phosphor SrAl2O4:Eu,Dy (SAOED) under an excitation at 336 nm. The quantum yield of the sample modified by GeO2 and MgF2 is as high as 95.0%. Understanding of the formation mechanism for enhancement of emission intensity and prolonging of phosphorescence duration of ZGOM is fundamentally important, which might be extended to other identified solid-state inorganic phosphor materials for advanced properties.
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