Phytochromes PR and PFR distributed in different organs of plant can effectively absorb red and far-red light, respectively. Therefore, plant growth can be controlled by changing the ratio of red light to far-red light. The emission of Pr3+ (transition from 3P0→3F2,3) and Mn4+(transition from 2Eg→4A2g) is located at the red and far-red range which matches with the absorption band of PR and PFR, respectively. Herein, NaLaMgWO6:Mn4+/Pr3+/Bi3+ phosphors with improving luminescence properties via Bi3+ doping have been successfully prepared by the sol-gel method. With the variation of temperature, the photoluminescence (PL) of Pr3+/Mn4+ (corresponding to PFR/PR) of titled phosphors can be tuned, which is very useful for controlling the plant growth. Moreover, based on the fluorescence intensity ratios (FIR) of the two activator Mn4+ and Pr3+, the maximum relative sensitivity was approximately 3.39%/K at 298 K. All the results indicated that the titled phosphor is a bifunctional material for plant growth illumination with high matching phytochrome (PR and PFR) and temperature sensing with high sensitivity.
Keywords: Optical temperature sensing; P(FR); P(R); Phosphor; Plant growth.
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