High concentration Eu3+-doped NaYb(MoO4)2 multifunctional material: Thermometer and plant growth lamp matching phytochrome PR

Phytochromes P-R and P-FR are distributed in various organs of plant, phytochrome P-R absorbs red light and phytochrome P-FR absorbs far-red light, respectively, so the flower induction, etc. can be controlled by changing the ratio of red light to far-red light. The emission of Eu3+(transition from D-5(0) -> F-7(2)) is located at the red range and matches with the absorption band of P-R. Herein, we synthesized successfully NaYb(MoO4)(2): Eu(3+)phosphors with the high doping concentration (50%) by hydrothermal method with further calcinations. The LED device was also fabricated by the blue InGaN chip combined with the red phosphors NaYb(MoO4)(2): 50%Eu3+ based on the excellent luminescent intensity. Moreover, the effect of temperature on the excitation intensity ratio of MoO42- to Eu3+ has also been studied, which provided the possibility of simultaneous luminescence and temperature measurement. This work is the first time to use Eu(3+)as a red source matching P-R, and the red phosphors have potential value to control plant growth. (C) 2018 Elsevier B.V. All rights reserved.