荧光粉
发光
红外线的
材料科学
光电子学
紫外线
吸收(声学)
硅
离子
量子效率
激光线宽
化学
光学
激光器
物理
有机化学
复合材料
作者
Xiaoyong Huang,Dechao Yu,Q. Y. Zhang
摘要
A near-infrared quantum cutting phosphor GdBO3:Tb3+,Yb3+ shows poor optical absorption in the ultraviolet-visible excitation spectral range and weak near-infrared luminescence in the 900–1100 nm range, which strongly limit its practical application in silicon-based solar cells, due to the inefficient excitation of the Tb3+ ions for their intra-4f forbidden transitions. Herein, Ce3+ ion has been codoped as a sensitizer in GdBO3:Tb3+,Yb3+, thus enlarging the absorption linewidth and increasing the absorption cross-sections in the ultraviolet-visible region. The presence of Ce3+ results in an enhancement in Yb3+ near-infrared emission intensity by a factor of ∼30, which makes these phosphors more attractive as luminescent downconversion materials for enhanced silicon-based solar cell performance. The relevant luminescence and energy transfer mechanisms involved have also been investigated. The present results demonstrate that the 4f−5d luminescence of Ce3+ may be used to sensitize the Tb3+–Yb3+ downconversion process.
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