Defect Engineering in a Eu2+-Doped β-Al2O3 Structure Blue Phosphor and Its Controllable Zero-Thermal Quenching Luminescence

• DOI: 10.1021/acssuschemeng.1c01726
• Publication Date: 2021-06-04T16:37:25Z
• Authors: Siqi Piao; Yichao Wang; Xufeng Zhou; Wanying Geng; Jinsu Zhang; Xizhen Zhang; Danyang Wu; Yongze Cao; Xiangping Li; Baojiu Chen
• Keywords: Color temperature; Quantum yield; Color rendering index; Ultraviolet

A series of K1–2x–2yBayAl11O17(KBAO):xEu2+ phosphors are designed to develop a blue phosphor with excellent thermal properties. All the samples present similar β-Al2O3 structures P63/mmc space group; K+ vacancy can exist stably until Ba2+ concentration exceeds around y = 0.3. KBAO:Eu2+ exhibits strong absorption for near-ultraviolet light and relatively standard emission. The mechanisms excitation emission spectrum variations have also been studied in detail. Based on adjustment numbers defect structure, K0.6Ba0.1Eu0.1Al11O17 remarkable quantum yield 91.2% terrific high-temperature characteristic. zero-thermal quenching performance mainly results from stabilization flowing electron number between Eu2+ 5d levels ε(0/–1) ε(+1/0) processes ionization recombination. bright fabricated white-light-emitting diode (WLED) gives color rendering index (CRI) Ra 87 correlated temperature (CCT) 4510 K, demonstrating that has application potential provide component WLED. In addition, our research is significant attempt achieving stable by subjective structure design, which provides reference value investigating new phosphors.