Time-resolved spectroscopy of intrinsic luminescence of Y₃Ga₅O₁₂ and (LaLu)₃Lu₂Ga₃O₁₂ single crystals

详细信息    查看全文

• 作者：Yu. Zorenko ; T. Zorenko ; V. Vistovskyy ; M. Grinberg ; T. Ł ; ukasiewicz
• 关键词：Intrinsic luminescence ; Excitons ; Y₃Ga₅O₁₂ (YGG) ; (LaLu)₃Lu₂Ga₃O₁₂ (LLGG) crystals
• 刊名：Optical Materials
• 出版年：2009
• 出版时间：October 2009
• 年：2009
• 卷：31
• 期：12
• 页码：1835-1838
• 全文大小：594 K

文摘

The nature of intrinsic luminescence of Y₃Ga₅O₁₂ (YGG) and (LaLu)₃Lu₂Ga₃O₁₂ (LLGG) single crystals grown from a melt was determined. In the case of a YGG single crystal containing Y_Ga antisite defects with a concentration of 0.25–0.275 at. % the intrinsic luminescence was considered as a superposition of luminescence of self-trapped excitons (STE), luminescence of excitons localized near antisite defects (LE(AD) centers) and luminescence caused by a recombination of an electron with a hole captured at Y_Ga antisite defects. Due to a large (2–3 % ) concentration of Lu_La antisite defects in LLGG single crystals the intrinsic luminescence was a superposition mainly of the LE(AD) center emission and the recombination luminescence of Lu_La antisite defects. The energy structure of the mentioned centers in YGG and LGGG hosts was determined from the excitation spectra of their luminescence under excitation by synchrotron radiation in the range of the fundamental absorption edge of these garnets.