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Acta Chimica Sinica >

2024 , Vol. 82 >Issue 8: 894 - 902

DOI: https://doi.org/10.6023/A24040135

Article

Photoluminescence Properties of CsZn2B3O7:Eu2+ Broadband Green-emitting Phosphor for White Light-emitting Diodes

  • Lei Chen ,
  • Hanyue Zhang ,
  • Qing Qing ,
  • Fang Song ,
  • Liping Li ,
  • Zhihua Leng
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  • a School of Chemistry and Chemical Engineering, Xi’an University of Architecture and Technology, Xi’an 710055, China
    b Instrument Analysis Center of Xi’an University of Architecture and Technology, Xi’an 710055, China
    c State Key Laboratory of Inorganic Synthesis and Preparative Chemistry, College of Chemistry, Jilin University, Changchun 130012, China
* E-mail: ;

Received date: 2024-04-19

  Online published: 2024-06-06

Supported by

Natural Science Basic Research Program of Shaanxi Province(2024JC-YBMS-384); Basic Science Research Project of Shaanxi Academy of Fundamental Sciences (Chemistry, Biology)(23JHQ077); Innovation and Entrepreneurship Training Program for Students of Xi'an University of Architecture and Technology(202310703048)

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Abstract

Near-ultraviolet pumped white light-emitting diodes (NUV-WLED), which are based on the combination of NUV LED chip with red, green and blue trichromatic phosphors, can effectively alleviate the "blue light harm" and improve the color rendering index. However, developing broadband tricolor phosphor with lower synthesis temperature is the key for large-scale application of NUV-WLED. In this study, CsZn2B3O7 (hereinafter abbreviated as CZBO) with low synthesis temperature and multiple cationic sites was selected as the matrix material. A series of Cs1-xZn2B3O7:xEu2+ (0.005≤x≤0.03, hereinafter abbreviated as CZBO:xEu2+) broadband green phosphors were synthesized by high-temperature solid-state reaction method. The emission peak and full width at half maximum of CZBO:xEu2+ green phosphor are 508 nm and 109 nm, respectively. CZBO:xEu2+ phosphors exhibit a broadband absorption around 373 nm, which can be well matched with 365 nm ultraviolet LED chips. There are three Eu2+ luminescence centers in the CZBO:xEu2+ phosphors, i.e. the Eu2+ ions occupied in the Cs(1), Cs(2) and Cs(3) sites, respectively. The optimal doping concentration of Eu2+ ions is 0.015, and the concentration quenching mechanism is dipole-dipole interaction. CZBO:0.015Eu2+ phosphor shows good chemical stability, whose emission intensity can still remain 98.7% of that of the pristine sample after being exposed to ambient atmosphere for 30 d. The color rendering index of LED device fabricated by coating CZBO:0.015Eu2+ green phosphor, commercial BaMg- Al10O17:Eu2+ blue phosphor and commercial (Ca,Sr)AlSiN3:Eu2+ red phosphor on a 365 nm ultraviolet LED chip is as high as 87. This fabricated LED device shows a stable warm white light emission under different currents (30~300 mA), and its color coordinates, color rendering index and related color temperature are almost unchanged. These results indicate that the CZBO:0.015Eu2+ green phosphor reported in this study has a potential application prospect in the field of ultraviolet LED chip driven white light emitting diode lighting.

Key words： Cs1-xZn2B3O7:xEu2+; borate; high-temperature solid-state method; green phosphor; white light emitting diode

Cite this article

Lei Chen , Hanyue Zhang , Qing Qing , Fang Song , Liping Li , Zhihua Leng . Photoluminescence Properties of CsZn2B3O7:Eu2+ Broadband Green-emitting Phosphor for White Light-emitting Diodes[J]. Acta Chimica Sinica, 2024 , 82(8) : 894 -902 . DOI: 10.6023/A24040135

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