Тип публикации: статья из журнала

Год издания: 2021

Идентификатор DOI: 10.1039/d1tc01770e

Аннотация: A high color rendering index white light emitting diode (WLED) is generally produced by combining yellow and red mixed phosphors on a blue chip. Herein we report a single component phosphor based on CaY₂Al₄SiO₁₂(CYAS) to achieve warm white light emission with a high color rendering index (R_a), which can be up to 90.5. Ce³⁺, Mn²⁺singly doped and co-doped CYAS phosphors have been synthesized by solid state reactions, respectively, for comparative investigations. The Rietveld X-ray diffraction (XRD) refinements show that the CYAS host crystallizes in a cubic structure with theIa3̄dspace group. The valence states of Ce and Mn inside the CYAS host have been confirmed by XPS and EPR. Ce³⁺occupies the Ca²⁺/Y³⁺site and generates a yellow emission band around 543 nm from its characteristic 5d-4f transition. Mn²⁺occupies both the dodecahedron Ca²⁺/Y³⁺and octahedral Al³⁺sites, emitting red and deep red lights at 616 nm and 750 nm, respectively. These two emission bands are attributed to the⁴T₁(⁴G)-⁶A₁(⁶S) transitions of Mn²⁺. Upon 460 nm light excitation, both the Ce³⁺and Mn²⁺characteristic emissions can be obtained, in which the emissions of Mn²⁺result from the occurrence of energy transfer from Ce³⁺in CYAS. All the results indicate that the prepared CYAS:Ce³⁺,Mn²⁺could be a promising single component phosphor for blue chip WLEDs.

Журнал: Journal of Materials Chemistry C

Выпуск журнала: Т. 9, № 34

Номера страниц: 11292-11298

ISSN журнала: 20507534

• Zhang Q. (Guangdong Province Key Laboratory of Rare Earth Development and Application,Institute of Rare Metals,Guangdong Academy of Sciences)
• Li J. (Guangdong Province Key Laboratory of Rare Earth Development and Application,Institute of Rare Metals,Guangdong Academy of Sciences)
• Jiang W. (Guangdong Province Key Laboratory of Rare Earth Development and Application,Institute of Rare Metals,Guangdong Academy of Sciences)
• Lin L. (Guangdong Province Key Laboratory of Rare Earth Development and Application,Institute of Rare Metals,Guangdong Academy of Sciences)
• Ding J. (Guangdong Province Key Laboratory of Rare Earth Development and Application,Institute of Rare Metals,Guangdong Academy of Sciences)
• Ni H. (Guangdong Province Key Laboratory of Rare Earth Development and Application,Institute of Rare Metals,Guangdong Academy of Sciences)
• Brik M.G. (Faculty of Science and Technology,Jan Dlugosz University)
• Molokeev M.S. (Far Eastern State Transport Univ.,Dept. Phys.)
• Wu M. (School of Marine Sciences,Sun Yat-Sen University)

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