光子晶体增强三线态-三线态弱光上转换发光特性研究

Photonic Crystals Enhanced Low-power Upconversion emission

基于三线态-三线态湮灭机制的长波激发短波发射的弱光频率上转换,由于所需激发光能量接近太阳光强度,在太阳能电池、光催化降解和生物成像等领域显现诱人应用前景。本文采用无皂乳液聚合法制备纳米尺寸的聚苯乙烯-甲基丙烯酸甲酯-丙烯酸(P(St-MMA-AA))单分散乳胶微球,通过控制表面活性剂用量来调控乳胶微球尺寸大小,并利用竖直沉积法制备获得与上转换发光体系匹配的光子晶体薄膜。研究表明,该光子晶体可有效增强双组份体系的上转换发光。为弱光上转换技术走向应用探索一条新途径。

Triplet triplet annihilation upconversion （TTA-UC）, that is, population of excited state at higher energy （shorter wavelength） with excitation at lower energy （longer wavelength）, has attracted much attention due to its potential applications in solar cells, photocatalytic degradation and biological imaging. Photonic-crystals, with the characteristic of photonic band gap based on Bragg diffraction, can control the propagation of light whose wavelength is in the range of photonic band gap in a certain direction. In this paper, mono-disperse latexmicrospheres with different particle sizes were synthesized vertical deposition method, latex microspheres with different by soap-free emulsion polymerization method. By diameter were self-assembled. The fabricated col- loidal photonic crystals were applied in enhancing triplet-triplet annihilation based up-conversion emission Such a convenient method of introducing the photonic crystal structure would be of great importance for promot-ing the real application of up-conversion emission.