NaLa2SbO6:Mn4+ far-red phosphor: Synthesis, luminescence properties and emission enhancement by Al3+ ions

• Published in: Journal of luminescence Vol. 219; p. 116865
• Main Authors: Shi, Lei, Han, Ya-jie, Wang, Shuang, Ma, Di, Mao, Zhi-yong, Wang, Da-jian, Li, Xi-ze, Zhang, Lu, Zhang, Zhi-wei, Lu, Xu-lin
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 01.03.2020
• Subjects: NLSO:Mn4; Photoluminescence; Plant cultivation and growth LEDs; Red phosphors; Plant cultivation and growth LEDs; Red phosphors; Photoluminescence; NLSO:Mn4
• ISSN: 0022-2313; 1872-7883
• DOI: 10.1016/j.jlumin.2019.116865

A novel far-red emission NaLa2SbO6(NLSO):Mn4+ phosphor was prepared by traditional high temperature solid state reaction method. In the range of 200–600 nm, NLSO:Mn4+ phosphors exhibit broad excitation band centered at 322 nm and 498 nm. Under the excitation of 322 nm, the phosphor exhibits a far-red emission band centered at 707 nm in the range of 600–800 nm. In NLSO:Mn4+ phosphors, the optimum doping concentration is x = 0.003. In addition, the effect of Al3+-doped on the luminescent properties of the materials was also studied. The optimum doping concentration of Al3+ is x = 0.004, and the luminescence intensity of Mn4+ can be increased by 53%. In addition, NLSO:0.003Mn4+, 0.004Al3+ phosphors have high internal quantum efficiency and good thermal stability. The CIE chromaticity coordinates of NLSO:0.003Mn4+, yAl3+ phosphors are calculated, and which are located in the far-red region. All the results show that the synthesized phosphors have great application prospects in plant cultivation. •Novel-type far-red emit phosphors NaLa2SbO6(NLSO):Mn4+ were synthesized by solid state reaction.•When the doping concentration of Al3+ is 0.4%, the PL intensity of NaLa2SbO6:Mn4+, Al3+ reaches the maximum.•At 423 K, the PL intensity of NaLa2SbO6:0.003Mn4+ decreased to 42.75% of the initial PL intensity.•The activation energy (Ea) of NaLa2SbO6:0.003Mn4+ and NaLa2SbO6:0.003Mn4+, 0.004Al3+ are 0.355 eV and 0.392 eV, respectively.