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浏览/检索结果: 共1条，第1-1条 帮助 限定条件 发表日期：2007    内容类型：会议论文     已选(0)清除 条数/页：5101520253035404550556065707580859095100   排序方式：请选择作者升序作者降序题名升序题名降序发表日期升序发表日期降序提交时间升序提交时间降序 Mechanisms of energy transfer in Pr3+ and Cr3+ codoped SrAl12O19 phosphor (EI CONFERENCE) 会议论文 209th ECS Meeting, May 7, 2006 - May 12, 2006, Denver, CO, United states Nie Z.; Zhang J.; Ren X. G.; Zhang G.; Wang X.-J. 收藏  |  浏览/下载：14/0  |  提交时间：2013/03/25 A two-step energy transfer was observed in Pr3+ and Cr 3+ codoped SrAl12O19 phosphor  which results in a two-photon luminescence for one UV/vacuum-UV photon absorbed. For one Pr 3+ ion excited to the lowest 4f5d states  two Cr3+ ions may be excited and emit two red photons due to 2E- 4A2 transitions of the Cr3+ ions  Cr 3+ ions can be excited into the 4T1(F) levels by cross relaxation of Pr3+ 1S0- 1I6 or by direct energy transfer from Pr3+ 3P0  1 states. The mechanisms of the two-step energy transfer process were studied based on spectra and lifetime measurements. copyright The Electrochemical Society.