A double perovskite-based red-emitting phosphor with robust thermal stability for warm WLEDs. Issue 11 (1st August 2020)

• Record Type: Journal Article
• Authors: Mao, Qinan; Shen, Biao; Yang, Tao; Zhong, Jiasong; Wu, Guoqiang
• Is Part Of: Ceramics international. Volume 46:Issue 11(2020)Part B
• Page Start: 19328
• Page End: 19334
• Publication Date: 2020-08-01
• Subjects: WLEDs -- Thermal stability -- Double perovskite -- Red-emitting; Ceramics -- Periodicals; Céramique industrielle -- Périodiques; Ceramics; Periodicals; Electronic journals; 666
• DOI: 10.1016/j.ceramint.2020.04.273
• Languages: English
• ISSNs: 0272-8842

Abstract

Abstract: Red-emitting Ba2 YSbO6 :Eu 3+ phosphors with double perovskite structure have been prepared by solid-state method. Phase structures, photoluminescence properties, and thermal stability performances have been investigated in detail. The prepared phosphors reveal a cubic phase with the space group of Fm-3m. They exhibit a doughty red emission band at 612 nm ascribed to the Eu 3+ : 5 D0 → 7 F2 transition under 393 and 465 nm excitation. The samples have high concentration quenching property with the optimal concentration reached to 70 mol%, deriving from the quadrupole-quadrupole interaction. Additionally, the Ba2 YSbO6 :Eu 3+ phosphors demonstrate robust thermal performance with the emission intensity retaining 78.8% at 423 K of that at 303 K. Ultimately, the phosphor-converted LED device is fabricated by combining the red-emitting Ba2 YSbO6 :Eu 3+ phosphor and YAG:Ce 3+ yellow ones to a blue chip (460 nm), which exhibits a warm white light with color rendering index(CRI) of 80.8 and correlated color temperature (CCT) of 5184 K.