Preparation And Properties Of Rare Earth Luminescent Nanomaterials For Plant Lighting By High-gravity Technology

Light is one of the important conditions for plant growth,which plays an important role in all stages of plant growth and development.Proper light can not only accelerate the growth and development process of plants,but also improve the quality of plants,so as to obtain more high-yield and high-quality plants.Plant lighting technology based on Light Emitting Diode（LED）light source matches the wavelength required for plant growth through combination regulation of phosphors with different emission wavelengths,improving the efficiency of resource utilization and the quality of agricultural environment.It has attracted wide attention in academia and industry in recent years.This paper studies the system optimization of rare earth luminescent nanomaterials and devices for high light efficiency LED lighting sources for plant lighting.The main contents are as follows:（1）In view of the problems of traditional commercial phosphors with many spectral peaks and low luminous purity,the Eu³⁺and Nd³⁺co-doped Ca₁₂Al₁₄O₃₃ luminous nanomaterial was prepared by"high-gravity sol-gel method+high temperature annealing"method.The wavelength of the obtained phosphors was 617 nm,which had high luminous efficiency and stable particle dispersion.It has good luminescence stability in high humidity environment.（2）Eu³⁺doped Gd₂（WO₄）₃ luminescent nanomaterials were prepared by the method of"high-gravity liquid precipitation method+high temperature annealing".Narrow band red emission phosphors excited by blue and purple light were obtained,which could be combined with the excitation chip light to control the ratio of red and blue light.（3）Using rare earth luminescent nano-materials as light conversion materials,led bare chips as the luminescent source,and the led components of the red light are designed.The proportion of red and blue emission was achieved by changing the proportion of phosphating powder and packaging glue from 1:1 to 11:1.At the same time,the influence of the working voltage of the led device on the device was studied,and the proportion of red blue light was estimated to be between 1:1 and 10:1.In addition,we took sprouts as research objects to explore their growth conditions under different light conditions,and finally found that they maintained a better growth and development rate when the ratio of red to blue light was 4:1.