【作者】 夹国华； 赵士龙； 邓德刚； 王焕平； 黄立辉； 华有杰； 李晨霞； 徐时清；

【Author】 Guohua Jia Shilong Zhao Degang Deng Huanping Wang Lihui Huang Youjie Hua Chenxia Li Shiqing Xu~* (College of Materials Science and Engineering,China Jiliang University,Hangzhou 310018,P.R.China)

【机构】 中国计量学院材料科学与工程学院；

【摘要】 采用改良Bridgman方法生长出透明度高、无缺陷、厘米级尺寸的KPb₂Cl₅:Mn²⁺晶体。测试了Mn²⁺掺杂KPb₂Cl₅晶体在不同温度下的电子光谱,通过比较发现,材料在红光区域的发射只在低温（比如10K和77K）才能观测到,此发射源于晶体基质中Pb²⁺离子;而橘红色区域的发射对应于Mn²⁺离子自旋禁戒跃迁4Tlg（4G）→6Alg（6S）。采用Tanabe-Sugano能级图对KPb2Cl5:Mn²⁺激发光谱做了细致解析,得到如下晶体场参数10Dq=7902 cm^-1,Racah参数B=618 cm^-1,C=3549 cm^-1,并且计算得到Mn²⁺能级结构与实验数据吻合的很好。更多还原

【Abstract】 KPb₂Cl₅:Mn²⁺ crystal with sizes of centimeters has been successfully grown by a modified Bridgman method.The electronic spectra Mn²⁺ in the title compound have been measured at different temperatures and compared,which reveals that the red emission observed at 10 and 77 K in the spectral range from 500 to 800 nm,which vanishes at room temperature,is associated with the radiation from Pb²⁺ ions with adjacent defects whereas the orange-red emission in the spectral range from 530 to 680 nm can be undoubtedly attributed to the spin forbidden transition 4T1g（4G）→6A1g（6S） of Mn²⁺.The electronic excitation spectra are interpreted in a strong crystal field scheme with the use of the Tanabe-Sugano diagram.Good agreement with the experimental spectroscopic data is obtained with the use of crystal field splitting parameter 10Dq = 7902 cm-1,Racah parameters B = 618 cm^-1,and C = 3549 cm.更多还原