4.7 Article

Enhanced local symmetry achieved zero-thermal-quenching luminescence characteristic in the Ca2InSbO6:Sm3+ phosphors for w-LEDs

期刊

CHEMICAL ENGINEERING JOURNAL
卷 410, 期 -, 页码 -

出版社

ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2020.128396

关键词

Sm3+; Local symmetry; Zero-thermal-quenching; w-LEDs

资金

  1. National Natural Science Foundation of China [12004312]
  2. Doctoral Scientific Research Foundation of Northwest AF University [Z109021814, Z1090219099]
  3. Fundamental Research Funds for the Central Universities [2452019076]
  4. Hunan Provincial Key Laboratory of Xiangnan RarePrecious Metals Compounds and Applications [2019XGJSKFJJ01]
  5. Construction Program of the key discipline in Hunan Province
  6. Projects of the Education Department of Hunan Province [18A465]
  7. Science and Technology Plan Project of Chenzhou city [jsyf2017014]

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Understanding the relationship between structural local symmetry and luminescence characteristics is crucial for designing optical materials. In this study, reddish-orange-emitting phosphors CISO:Sm3+ were successfully synthesized and applied in w-LEDs, showing increasing photoluminescence intensity with temperature rise, high color purity, and proper CIE chromaticity coordinates. These phosphors have great potential as substitutes in horticultural and solid lighting, providing new insights for constructing thermally stable phosphors for optical applications.
A material's structure vitally affects its luminescence property, which in turn determines its application. Therefore, understanding the correspondence between structural local symmetry and luminescence characteristics is vital for the design and synthesis of optical materials. A series of solid solution reddish-orange-emitting phosphors Ca2InSbO6:Sm3+ (CISO:Sm3+) was synthesized by the high-temperature solid-phase method and applied for white-light-emitting diodes (w-LEDs). Under 407 nm excitation, CISO:Sm3+ phosphors showed intense reddish-orange emission at 600 nm that is attributed to the (4)G(5/2) -> H-6(7/2) transition of Sm3+ ions. Given that Sm3+ ions are a structural probe, the relationship between their local symmetry and luminescence properties was discussed in detail. The photoluminescence intensity of CISO:Sm3+ phosphors continuously increases with rising temperature from 298 to 480 K based on the enhanced local symmetry. This phenomenon was further analyzed using the trap theory and charge compensation mechanism. High color purity (similar to 99.9%) and proper Commission International del ' Eclairage (CIE) chromaticity coordinates were achieved for the CISO:Sm3+ phosphors. Finally, the fabricated w-LED displayed superior color rendering index (R-a = 93) and CIE chromaticity coordinates (0.330, 0.357) and thus has great potential as reddish-orange-emitting substitutes in horticultural and solid lighting. This work initiates a new insight to construct thermally stable phosphors for optical applications.

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