1 宁波大学 光电子功能材料重点实验室, 浙江 宁波 315211
2 大连海事大学 物理系, 辽宁 大连 116026
应用坩埚下降法生长了Pr3+离子掺杂的Na5Lu9F32单晶体.系统地研究了Pr3+掺杂的Na5Lu9F32单晶的吸收光谱、荧光光谱和荧光衰减曲线.应用Judd-Ofelt理论分析计算了其光学强度等参数, 结果表明Pr3+离子处于Pr-F强共价键的高对称环境中.在440 nm光的激发下观察到以482、523和605 nm为中心的尖锐的强荧光发射带.研究了Pr3+掺杂浓度对上述发光强度的影响规律, 实验发现当Pr3+掺杂浓度达到~0.5 mol%时, 其荧光发射强度达到最大.分析了环境温度从298 K到443 K变化时对荧光强度的影响, 随着温度的增加, 荧光强度逐步变弱, 且其523 nm的绿光受温度影响要小于482 nm的蓝光和605 nm的红光.
光学材料 Na5Lu9F32单晶体 变温 能量传递 光学性能 Optical materials Na5Lu9F32 single crystals Temperature dependent Energy transfer Optical properties
Author Affiliations
Abstract
1 Key Laboratory of Photo-electronic Materials, Ningbo University, Ningbo 315211, China
2 College of Physics and Electronic Engineering, College of Chemistry and Pharmaceutical Engineering, Nanyang Normal University, Nanyang 473061, China
3 Department of Physics, Dalian Maritime University, Dalian 116026, China
High-quality KMgF3 single crystal containing 0.5 mol% europium (Eu) was prepared by an improved Bridgman method. X-ray diffraction (XRD), photoluminescence spectra and fluorescence lifetime were measured. The results in-dicate the reduction of Eu3+ to Eu2+ in the KMgF3 single crystal. Under the excitation of 259 nm, 370 nm and 394 nm, the sample has two distinct emissions of Eu2+:4f7→4f7(~363 nm) and 4f65d1→4f7 (~440 nm). The substitution site for Eu ion is confirmed. The optical property investigation result shows that the Eu2+ doped KMgF3 single crystal may be used as potential laser media and related materials for optical devices.
光电子快报（英文版）
2019, 15(1): 26
Author Affiliations
Abstract
1 Key Laboratory of Photo-electronic Materials, Ningbo University, Ningbo 315211, China
2 College of Physics and Electronic Engineering, College of Chemistry and Pharmaceutical Engineering, Nanyang Normal University, Nanyang 473061, China
3 Department of Physics, Dalian Maritime University, Dalian 116026, China
The growth of Na5Lu9F32 single crystals doped with Cr3+ ions in 0.1 mol%, 0.2 mol% and 0.5 mol% concentrations by Bridgman method was reported. The optical absorption and luminescence spectra decisively demonstrate that the Cr dopant enters Na5Lu9F32 as Cr3+. Fluorescence emission at wavelengths of 418 nm, 444 nm, 653 nm and 678 nm can be observed under the excitation of 372 nm and the fluorescence lifetime at 418 nm was measured to be ~10.31 μs. The possible crystal sites for Cr3+ ions in Na5Lu9F32 single crystal were discussed, and the lattice parameter Dq, Racach parameters B and C were estimated.
光电子快报（英文版）
2018, 14(5): 355
宁波大学 材料与化学工程学院 光电子功能材料实验室, 浙江 宁波 315211
采用高温熔融法制得组分为43SiO2-23Al2O3-27LiF-17YF3-xPr2O3(x=0.05、0.1、0.15、0.2)(mol%)的前驱玻璃.玻璃样品分别经 530℃、540℃ 和 550℃热处理后, 制备出一系列 Pr3+离子掺杂含 LiYF4晶粒的微晶玻璃.晶相由 X 射线衍射与透射电子显微镜证实, 晶粒平均尺寸为 14±4 nm.紫外-可见分光光度计证实微晶玻璃具有良好的透光性.研究热处理前后样品的光谱特性和荧光寿命, 对封装成 LED 后的相关参数进行测试.结果表明, 在波长 444 nm 的激发下, 掺杂 Pr3+离子浓度为 0.3 mol 且热处理温度为 550℃ 的微晶玻璃具有最高光输出强度, 封装成 LED 后发射出白光, 其色坐标为x=0.33,y=0.35.
微晶玻璃 荧光性能 白光 色坐标 LiFY4∶Pr3+ LiFY4∶Pr3+ Glass ceramics Luminescent properties White light Chromaticity coordinate
1 宁波大学 光电子功能材料重点实验室， 浙江 宁波315211
2 宁波大学 材料科学与化学工程学院， 浙江 宁波315211
用坩埚下降法生长获得了尺寸为φ25 mm×90 mm、Tm2O3初始掺杂摩尔分数为0.5％的CdWO4单晶。晶体的颜色由上部血红色逐渐加深至下部的黑褐色。对不同部位的晶体薄片进行800 ℃的氧化处理，测定了处理前后不同部位的吸收光谱和FTIR红外光谱。经氧气退火处理后，由于氧空位缺陷减少，晶体的颜色明显变淡。在吸收光谱中观测到421,684，805 nm的吸收带。其中421 nm的吸收峰随退火温度的升高而逐步减弱，经800 ℃处理后基本消失。在808 nm激光二极管激发下，观察到中心波长为1.5 μm和1.8 μm的荧光发射，分别对应于Tm3+的3H4→3F4，3F4→3H6的能级跃迁。
CdWO4单晶 坩埚下降法 光谱性质 Tm3+掺杂 CdWO4 single-crystal Brigdman method optical spectra Tm3+ -doped
