Crystal Chemistry and Luminescence of Ce3+-Doped Lu2CaMg2(Si,Ge)3O12 and Its Use in LED Based Lighting

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• 作者：Anant A. Setlur ; William J. Heward ; Yan Gao ; Alok M. Srivastava ; R. Gopi Chandran ; and Madras V. Shankar
• 刊名：Chemistry of Materials
• 出版年：2006
• 出版时间：July 11, 2006
• 年：2006
• 卷：18
• 期：14
• 页码：3314 - 3322
• 全文大小：242K
• 年卷期：v.18,no.14(July 11, 2006)
• ISSN：1520-5002

文摘

In this paper, we describe the formation and luminescence of a new garnet phosphor for light emittingdiode (LED) based lighting, Lu₂CaMg₂(Si,Ge)₃O₁₂:Ce³⁺. The regions for garnet phase formation are initiallydescribed with respect to larger rare earth substitution and show reasonable correlation to previous crystalchemistry studies for the garnet parent structure. While the pure silicate phosphor also has apatite secondphases, a significant amount of Ce³⁺ enters the garnet phase, giving Ce³⁺ luminescence that is significantlyredder when compared to typical Al³⁺ garnet phosphors with quantum efficiencies comparable tocommercial Ce³⁺ garnet phosphors. Potential reasons for the emission red shift and the high quantumefficiency are discussed. Finally, the performance of these new phosphors is tested within LED basedlamps. Lamps using these phosphors can reach color temperatures required for general illumination lightingand also have comparable phosphor conversion efficiencies when compared to lamps using typical garnetphosphors.