发光
热液循环
光致发光
X射线吸收精细结构
材料科学
激发态
兴奋剂
高压灭菌器
水热合成
纳米颗粒
吸收(声学)
光电子学
纳米技术
光化学
化学工程
化学
原子物理学
复合材料
光谱学
冶金
物理
量子力学
工程类
作者
Wai-Tung Shiu,Xincheng Li,Lo‐Yueh Chang,Jeng-Lung Chen,Yung Yang Lin,Bi‐Hsuan Lin,George E. Sterbinsky,Tianpin Wu,John A. McLeod,Lijia Liu
标识
DOI:10.1016/j.jlumin.2023.120113
摘要
Cr-doped ZnGa2O4 (CZGO) is a near-infrared-emitting material with long-lasting persistent luminescence. This unique property makes it a great candidate in optical imaging and sensing for various biomedical applications. Nanosized CZGO can be synthesized via a hydrothermal approach, but the reaction temperatures reported in existing literature vary from 120 °C to 220 °C, approaching the highest temperature allowed for a standard autoclave vessel. The reason for choosing a particular hydrothermal synthesis temperature has rarely been discussed, and it is unclear whether the resulting CZGO possess the same optical properties. This work compares CZGO nanoparticles synthesized at temperatures from the lowest reported 120 °C and to as high as 220 °C. We find that although all the synthesized CZGO are light emitting, they exhibit different luminescence intensities and respond differently to the change of excitation energy. X-ray absorption fine structure (XAFS) analysis is employed to investigate the local chemical environment around Zn, Ga and Cr, respectively. We found synthesis temperature strongly influences the Ga species formed in these particles. The energy transfer mechanism is further elucidated using X-ray excited optical luminescence (XEOL) in combination with element-specific XAFS. Two energy transfer paths are identified, which explains the different excitation energy dependencies of the observed photoluminescence.
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