Synthesis and luminescence properties of a double perovskite Ca2LaNbO6:Mn4+ deep-red phosphor. (December 2018)

• Record Type: Journal Article
• Authors: Lu, Zuizhi; Wang, Huan; Yu, Dongyan; Huang, Tianjiao; Wen, Lingling; Huang, Meixin; Zhou, Liya; Wang, Qiuping
• Is Part Of: Optics & laser technology. Volume 108(2018)
• Page Start: 116
• Page End: 123
• Publication Date: 2018-12
• Subjects: Deep red-emitting -- Mn4+ -- Phosphors -- Thermal stability; Optics -- Periodicals; Lasers -- Periodicals; Electronic journals; 621.366
• DOI: 10.1016/j.optlastec.2018.06.062
• Languages: English
• ISSNs: 0030-3992

Abstract

Graphical abstract: Highlights: Red phosphors Ca2 LaNbO6 :Mn 4+ phosphors were synthesized for the first time. Board excitation bands can be efficiently excited by near-UV light to emit deep red emission. Tanabe–Sugano energy level diagram is used to analysis the luminescence mechanism. Temperature dependence spectra is investigated to demonstrate its good thermal stability. Abstract: A deep-red-emitting Ca2 LaNbO6 :Mn 4+ (CLN:Mn 4+ ) phosphor was synthesized by high-temperature solid-state reaction method. A broad absorption band between 250 and 600 nm was observed in UV absorption spectra. Excitation spectra showed two broad excitation peaks (358 and 518 nm), which can be attributed to the near-UV emitting InGaN chip. Luminescence spectra showed a broad emission band from 600 nm to 700 nm centered at 685 nm. The major mechanism for fluorescence quenching was multipolar interaction. Fluorescence lifetime decreased from 0.570 ms to 0.400 ms, which was greater than that of rare earth-doped phosphors. CLN:Mn 4+ phosphor showed temperature quenching from 298 K to 498 K, and Ea calculation (0.315 eV) revealed that the thermal stability of CLN:Mn 4+ phosphor was greater than that of commercial CaAlSiN3 :Eu 2+ (∼0.2 eV) phosphors. The CIE of CLN:Mn 4+ phosphor (0.696, 0.304) was close to the standard values of the National TV Standards Committee. All these results proved that CLN:Mn 4+ phosphor can be applied in white-light-emitting diodes.