Preparation and upconversion luminescence modification of YbPO₄:Er³⁺ inverse opal heterostructure

Zhuangzhuang Chai，Zhengwen Yang，Anjun Huang，Chengye Yu，Jianbei Qiu，Zhiguo Song

College of Materials Science and Engineering, Kunming University of Science and Technology

摘 要：Photonic crystal heterostructures composed of YbPO₄:Er³⁺ inverse opal and polystyrene opal were prepared via a template-assisted process, which exhibited two photonic band gaps. The microstructure,phase and optical properties of photonic crystal heterostructures were investigated by x-ray diffraction,scanning electron microscopy, fluorescence spectroscopy, absorption spectroscopy, fluorescence lifetime,etc. The upconversion emission suppression caused by single photonic band gap from the following YbPO₄:Er³⁺ inverse opal or the upper opal was observed. The upconversion luminescence was strongly suppressed due to the two photonic band gap overlapping effect caused by the following YbPO₄:Er³⁺ inverse opal or the upper opal. The modified mechanisms of upconversion luminescence were discussed by the upconversion luminescence lifetime of YbPO₄:Er³⁺ photonic crystal heterostructures. The results demonstrated the modified upconversion luminescence is attributed to the photon trapping caused by Bragg reflection of photonic crystal heterostructures.

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