In:
Dalton Transactions, Royal Society of Chemistry (RSC), Vol. 51, No. 17 ( 2022), p. 6622-6630
Abstract:
Mixed-valence Eu 2+/3+ -activated phosphors have attracted wide attention due to their excellent luminescence tunability. Steady control of the Eu 2+ /Eu 3+ ratio is the key to achieving reproducible Eu 2+/3+ co-doped materials. In this work, BaMgP 2 O 7 : x Eu 2+/3+ (BMPO:Eu, x = 0.001–0.20) was successfully prepared by the traditional solid-state method in air. Eu 3+ undergoes selective self-reduction at Ba 2+ sites surrounded by a [P 2 O 7 ] framework, leading to quantitive Eu 2+ /Eu 3+ . The phosphors exhibit a blue-violet emission band at ∼410 nm due to 5d–4f transitions of Eu 2+ and a group of red emission peaks from 5 D 0 – 7 F J of Eu 3+ . Controllable multicolor emissions are realized by regulating the Eu content and excitations. A linear response of overall luminescence intensity to irradiation dose makes the phosphor appropriate for X-ray detection. The combination of UV-blue excitation-dependent color evolution and X-ray luminescence qualifies the phosphors with great potential for multi-level anti-counterfeiting. In addition, Eu 3+ presents abnormal anti-thermal quenching, so that the fluorescence intensity ratio (FIR) of Eu 2+ /Eu 3+ changes in the temperature range of 300–520 K, suggesting a promising application in optical thermometry. Therefore, selectively partial self-reduction in a multi-cationic host is an effective strategy to design mixed-valence co-doped materials, providing a multiplicity of applications.
Type of Medium:
Online Resource
ISSN:
1477-9226
,
1477-9234
Language:
English
Publisher:
Royal Society of Chemistry (RSC)
Publication Date:
2022
detail.hit.zdb_id:
1472887-4
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