摘要
从光致发光光谱角度探讨了海南蓬莱蓝宝石的呈色机理。结果发现:与蓝宝石吸收光谱的500～700nm吸收宽带相比,在500～720nm发光波段内存在566.8nm锐峰、600nm左右肩峰和Cr3+的694.2nm特征峰。600nm肩峰与其吸收峰镜像对称,566.8nm处锐峰的产生原因复杂。600nm肩峰可能与Fe2+-Fe2+离子对的电子跃迁有关;566.8nm锐峰因532nm激光激发Fe2+-Ti4+或Fe2+-Fe3+间的电荷迁移带,通过晶格造成Si4+、Mg2+等微量杂质离子敏化而产生。光致发光谱中呈现更多谱峰,能呈现离子跃迁时不同离子间发生的相互作用,为500～700nm吸收宽带由不同致色机制的叠加给出了直接证明,是一种能全面地研究宝石矿物中致色元素能级结构的有效方法。
Coloration mechanism of sapphire from Penglai Town, Hainan Province, was discussed with the method of photoluminescence （PL） spectra. Compared with 500 ～700 nm absorption wide spectral band, there are two peaks at 566. 8 and 600 nm, and a characteristic peak of Cr3＋ at 694. 2 nm in the 500 - 720 nm luminescence spectra of sapphire. The 600 nm shoulder peak is mirror symmetrical to its corresponding absorption peak, and the causes of 566. 8 nm narrow peak are complex. The 600 nm shoulder peak could be due to the electron transition of the exchange-coupled Fe2＋- Fe2＋ pair, and the 566. 8 nm narrow peak could be due to the sensitization of Si4＋ and Mg2＋ i- ons through crystal lattice when Fe2＋- Ti4＋ or Fe2＋- Fe3＋ charge transfer bands is activated by 532 mn laser. More peaks are presented in PL spectra, providing a direct proof that PL spectra is the presentation of interactions among different coloration mechanisms. With further development, the technology of PL spectra might become an effective method for analyzing the energy level structures of colorgenous elements in gems.
出处
《矿物学报》
CAS
CSCD
北大核心
2009年第4期447-451,共5页
Acta Mineralogica Sinica
基金
国家青年自然科学基金资助项目(批准号:49503046)
湖北省高等学校科研基金(2002B04002)
湖北省高层次人才项目
关键词
蓝宝石
致色机制
光致发光
海南蓬莱
sapphire
coloration mechanism
photoluminescence
Penglai Town, Hainan Province
