B. Han,X. Yang,J. Ren,L. Liu,E. Zhao,X. Zhu,J. Zhu,H. Ma,A. Li,P. Teng
Indoor artificial cultivation of plants is a novel technology applied to agriculture, and the emission band of luminescent materials can be matched with the needs of plants to promote plant growth. In this contribution, novel Mn 4+ doped Sr 2 GdTaO 6 (SGTO) deep-red phosphor was synthesized. This material was characterized, in detail, by X-ray diffractometer, SEM, and photoluminescence emission spectra. Sr 2 GdTaO 6 :Mn 4+ (SGTO:Mn 4+ ) can be effectively excited by near-ultraviolet (NUV) light, and the broadband emission of deep-red light matches the absorption band of plant phytochromes P R and P FR . The optimum doping concentration of Mn 4+ in SGTO was 0.6 mol%, and the concentration quenching mechanism was attributed to dipole-quadrupole ( d - q ) electric interaction. The photoluminescence emission intensity of SGTO:0.006Mn 4+ at 423 K is 80.6% of that at room temperature and the internal quantum efficiency of SGTO:0.006Mn 4+ is 36.09%. Finally, the performance of the commercial 440 nm light-emitting diode chip/SGTO:0.006Mn 4+ encapsulated light-emitting diode device was stable and can meet the needs of plants for the blue and red light. The results showed that SGTO:0.006Mn 4+ deep-red phosphor is expected to be a phosphor suitable for indoor plant growth lighting.
Optical temperature sensing and plant growth lighting multifunctional applications can be realized by red luminescent materials. In this paper, novel Sm 3+ and Sm 3+ -Mn 4+ activated Sr 2 GdTaO 6 (SGTO) red phosphors for plant growth and optical temperature sensing were comprehensively analyzed. The phase, luminescence property and thermal stability of the material were tested. For PL performance, SGTO:0.075Sm 3+ exhibits the maximum emission intensity in the range (560–670 nm). The emission range of SGTO:0.075Sm 3+ after introducing Mn 4+ is mainly dark red light emission in the range from 630 to 750 nm, and the optimum doping concentration of Mn 4+ is determined to be 0.3 %. The emission band of SGTO:0.075Sm 3+ and SGTO:0.075Sm 3+ , 0.003Mn 4+ matches the absorption band of the plants. For optical temperature sensing properties, the relative sensitivity ( S r ) and absolute sensitivity ( S a ) of SGTO:0.075Sm 3+ , 0.003Mn 4+ are 2.94 K −1 (298 K) and 0.635 K −1 (573 K), respectively. The results indicate that Sm 3+ -Mn 4+ activated SGTO red phosphor is a luminescent material with potential application in plant growth and optical temperature sensing field.
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