A novel Ca2ScNbO6:Eu3+ phosphor with excellent thermal stability for high color rendering WLED

• Published in: Optical materials 2023-06, Vol.140, p.113871, Article 113871
• Main Authors: Fan, Haoshuang, Meng, Xianguo, Xu, Yingchao, Lu, Yi, Liu, Yue
• Format: Article
• Language: English
• Subjects: Double perovskite; Eu3+ ions; Orange-red phosphor; Thermal stability
• ISSN: 0925-3467; 1873-1252
• DOI: 10.1016/j.optmat.2023.113871

A series of novel Ca2-xScNbO6:xEu3+ double perovskite phosphors were synthesized by high-temperature solid-state reaction technique. The physical phase, micromorphology, photoluminescence properties, concentration and thermal quenching effect of the phosphors were analyzed. Research shows that: Ca2-xScNbO6:xEu3+ phosphors can be excited by ultraviolet or Blu-ray LED chips and displays a strong orange-red light luminescence at 614 nm. The sample with optimum doping concentrations has a quantum efficiency of 99.13% at room temperature, and the brightness only decays by 7.49% at 433 K. The sample has excellent thermal stability, with a thermal quenching extinction activation energy of 0.497 eV. Finally, the samples are packaged with 395 nm chips together with green and blue phosphors to obtain white LED, that emits bright white light under forward bias currents and have the advantages of lower correlated color temperature (less than 4390 K) and higher color rendering index (higher than 89). The above results indicate that Eu3+ ion-doped Ca2ScNbO6 phosphor can be applied to white LED technology. •Successfully synthesized a novel Ca2ScNbO6 orange-red phosphors by high-temperature solid-state reaction technique.•The samples can be excited by ultraviolet LED chips and exhibit strong orange-red light luminescence at 614 nm.•The sample of Ca2ScNbO6:0.35Eu3+ has high internal quantum efficiency (QE = 99.13%).•The samples luminescence intensity at 433 K can still be maintained at 92.51% of the room temperature.•The sample can be mixed with green and blue phosphors to produce white LEDs with high color rendering index (CRI ≥ 89).