Journal
DALTON TRANSACTIONS
Volume 48, Issue 7, Pages 2455-2466Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c8dt04955f
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Funding
- National Natural Science Foundation of China [51772159, 51472125, 11504188, U1504626, 51702171]
- Natural Science Foundation of Zhejiang Province [LZ17E020001]
- K. C. Wong Magna Fund in Ningbo University
- Sichuan University of Science and Engineering
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Mn4+-Doped oxide phosphors are under intensive investigation owing to their low manufacture cost and attractive luminescent features for indoor plant cultivation applications. However, it is still a challenge to develop Mn4+-doped oxides with high luminescence efficiency and thermal stability. Herein, Mn4+-Mg2+ pairs are incorporated into a CaGdAlO4 host to reduce non-radiative channels formed by Mn4+-Mn4+-O2- clusters. The photoluminescence and quantum efficiency are significantly enhanced after the introduction of Mg2+ ions to the host. A prolonged Mn4+ decay time is also obtained from the Mn4+/Mg2+ co-doped samples. Intense red emission with a narrow peak at 712 nm due to the E-2(g) (4)A(2g) transition of Mn4+ ions is observed under 335 nm excitation. LEDs fabricated by coating the synthesized phosphor on a 365 nm near-UV chip exhibit an intense deep-red emission with CIE chromaticity coordinates of (0.712, 0.285). The results indicate Mn4+/Mg2+ co-doped CaGdAlO4 phosphors may be applicable to plant cultivation fields.
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