Chen Zhenhua, Wei Qinhua, Tang Gao, Shi Hongsheng, Qin Laishun
College of Materials and Chemistry, China Jiliang University, Hangzhou 310018, China.
Xinjiang Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Urumqi 830011, China.
Nanomaterials (Basel). 2023 Mar 20;13(6):1106. doi: 10.3390/nano13061106.
With the improvement of the conversion efficiency of LED chip and fluorescent material and the increasing demand for high-brightness light sources, LED technology has begun to move toward the direction of high-power. However, there is a huge problem that high-power LED must face with a large amount of heat generated by high power causing a high temperature thermal decay or even thermal quenching of the fluorescent material in the device, resulting in a reduction of the luminous efficiency, color coordinates, color rendering index, light uniformity, and service life of LED. In order to solve this problem, fluorescent materials with high thermal stability and better heat dissipation were prepared to enhance their performance in high-power LED environments. A variety of boron nitride nanomaterials were prepared by the solid phase-gas phase method. By adjusting the ratio of boric acid to urea in the raw material, different BN nanoparticles and nanosheets were obtained. Moreover, the control of catalyst amount and synthesis temperature can be used to synthesize boron nitride nanotubes with various morphologies. By adding different morphologies and quantities of BN material in PiG (phosphor in glass), the mechanical strength, heat dissipation, and luminescent properties of the sheet can be effectively controlled. PiG prepared by adding the right number of nanotubes and nanosheets has higher quantum efficiency and better heat dissipation after being excited by high power LED.
随着LED芯片和荧光材料转换效率的提高以及对高亮度光源需求的增加，LED技术已开始朝着高功率方向发展。然而，存在一个巨大的问题，即高功率LED必须面对高功率产生的大量热量，这会导致器件中的荧光材料出现高温热衰减甚至热猝灭，从而导致LED的发光效率、色坐标、显色指数、光均匀性和使用寿命降低。为了解决这个问题，制备了具有高热稳定性和更好散热性能的荧光材料，以提高它们在高功率LED环境中的性能。通过固相-气相法制备了多种氮化硼纳米材料。通过调整原料中硼酸与尿素的比例，获得了不同的BN纳米颗粒和纳米片。此外，通过控制催化剂量和合成温度，可以合成具有各种形貌的氮化硼纳米管。通过在玻璃荧光粉（PiG）中添加不同形貌和数量的BN材料，可以有效控制片材的机械强度、散热和发光性能。在由高功率LED激发后，添加适量纳米管和纳米片制备的PiG具有更高的量子效率和更好的散热性能。
