Significant improved quantum yields of CaAl12O19:Mn4+ red phosphor by co-doping Bi3+ and B3+ ions and dual applications for plant cultivations

• Published in: Journal of luminescence Vol. 201; pp. 314 - 320
• Main Authors: Zhu, Yuejun, Qiu, Zhongxian, Ai, Bingyan, Lin, Yiting, Zhou, Wenli, Zhang, Jilin, Yu, Liping, Mi, Qinghua, Lian, Shixun
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 01.09.2018
• Subjects: Bi3; CaAl12O19:Mn4; H3BO3; Plant growth LEDs; Solar spectral conversion; Plant growth LEDs; CaAl12O19:Mn4; Solar spectral conversion; H3BO3; Bi3
• ISSN: 0022-2313; 1872-7883
• DOI: 10.1016/j.jlumin.2018.05.006

CaAl12O19: Mn4+ has been reported as a red phosphor with good color purity. A quaternary-doping strategy was adopted to improve the optical properties in this work. Phosphors of general formula Ca1-mAl12-x-y-nO19: xMn4+, yMg2+, mBi3+, nB3+ (CAO:MMBB) were synthesized by high-temperature solid-state method. A broad band deep-red emission from Mn4+ centered at 654 nm was observed, and two strong absorption bands within the ultraviolet range (350–400 nm) and blue-green region peaked at 460 nm were confirmed. The incorporation of co-dopants brought about a remarkable enhancement of the luminescence intensity. The quantum yield of CAO:MMBB reached 84.9%, which is approximately 1.35 times higher than that of as-reported binary-doping phosphors CaAl12-x-yO19: xMn4+, yMg2+ (CAO:MM). The possible mechanism of co-doping Bi3+ and B3+ ions was discussed in detailed. CAO:MMBB phosphor shows a dual application in agriculture either as solar spectral conversion auxiliary in greenhouse plastic films or as a red component in blue-chip based plant growth light emitting diodes (PG-LEDs). The quaternary-doped phosphors CaAl12O19: Mn4+, Bi3+, Mg2+, B3+ (CAO:MMBB) were designed and synthesized. The synergetic effect of Bi3+ and B3+ leads to high quantum yields (84.9%) of deep-red emission originating from Mn4+ ion 3d3 transitions in octahedral symmetry. The fabrication of solar spectral conversion (SSC) films and plant growths (PG) LEDs added CAO:MMBB show excellent dual applications in plant cultivations. [Display omitted]