White light generation through the zinc metaphosphate glass activated by Ce, Tb and Mn ions |
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| Authors: | R Martínez-Martínez A Speghini M Bettinelli C Falcony U Caldio |
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| Institution: | aDepartamento de Física, Universidad Autónoma Metropolitana-Iztapalapa, Universidad, P.O. Box 55-534, 09340 México, D.F., México;bDipartimento Scientifico e Tecnologico, Università di Verona, and INSTM, UdR Verona, Strada Le Grazie 15, I-37314 Verona, Italy;cCentro de Investigaciones y Estudios Avanzados del IPN, Departamento de Física, P.O. Box 14-7400, 7000 México, DF, México |
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| Abstract: | The photoluminescence of Ce3+, Tb3+ and Mn2+ ions was investigated in the Zn(PO3)2 glass. The blue and green emissions of Tb3+ ions and the red emission of Mn2+ ions are enhanced upon UV excitation through a non-radiative energy transfer from Ce3+ to Tb3+ and Mn2+ ions. The efficiency of this transfer was estimated in at least 62%. It is demonstrated that this glass activated with three ions (Ce3+, Tb3+ and Mn2+) can generate white light emission (x=0.420 and y=0.423 chromaticity coordinates and 3440 K colour temperature) under excitation at 254 nm, i.e., using an AlGaN-based LED as excitation source. |
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| Keywords: | Zn(PO3)2 Ce3+ Tb3+ Mn2+ Zinc metaphosphate glasses Photoluminescence Non-radiative energy transfer Energy transfer efficiency White light |
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