Tunable emission and thermal sensitivity via energy transfer from Bi3+ to Eu3+ in BaY2Al2Ga2GeO12

BaY2Al2Ga2GeO12 (BYAGGO):Eu3+ and BaY2Al2Ga2GeO12:0.03Bi3+, yEu3+ phosphors have been prepared via a high-temperature solid phase method. BYAGGO:Eu3+ has a stronger characteristic emission of Eu3+ at 592 nm attributed to magneto-dipole transitions under 245 nm excitation, indicating that Eu3+ is mor...

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Published inCrystEngComm Vol. 26; no. 8; pp. 1170 - 1177
Main Authors Ye, Jin, Lin, Huayan, Chen, Hongtao, Fang, Fei, Li, Yuyan, Xiong, Yanbin, Li, Ma, Xiao-Jun, Wang
Format Journal Article
LanguageEnglish
Published Cambridge Royal Society of Chemistry 20.02.2024
Subjects
Bismuth
Color temperature
Dipoles
Emission
Energy transfer
Europium
Excitation
High temperature
Phosphors
Solid phases
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Summary:BaY2Al2Ga2GeO12 (BYAGGO):Eu3+ and BaY2Al2Ga2GeO12:0.03Bi3+, yEu3+ phosphors have been prepared via a high-temperature solid phase method. BYAGGO:Eu3+ has a stronger characteristic emission of Eu3+ at 592 nm attributed to magneto-dipole transitions under 245 nm excitation, indicating that Eu3+ is more inclined to occupy the central lattice of the octahedron with inverted symmetry. The lattice of Eu3+ ions expands to the asymmetric dodecahedron center in Eu3+ and Bi3+ ions co-doped in BYAGGO. The emission of BYAGGO:Bi3+ overlaps the excitation of BYAGGO:Eu3+, implying that energy transfer (ET) from Bi3+ to Eu3+ is possible. Furthermore, the fluorescence decay lifetime is the direct proof of energy transfer in BaY2Al2Ga2GeO12:0.03Bi3+, yEu3+. The energy transfer efficiency reaches 72% at y = 0.25. Finally, BYAGGO:0.03Bi3+, 0.09Eu3+ phosphor is employed for a WLED device with a color temperature of 3825 K and a color rendering index (Ra) of 88.75.
ISSN:1466-8033
DOI:10.1039/d3ce01197f