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14 June 2004 Upconversion mechanisms in KPb2Cl5:Er3+ crystal
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In this work we report infrared to visible upconversion luminescence in the low phonon-energy host material KPb2Cl5 doped with Er3+ ions. The low phonon energy strongly reduces multiphonon relaxation in this host. As a consequence, in addition to the strong green upconversion luminescence from 2H11/2,4S3/2) levels at room temperature, blue luminescence from 2H9/2 and 4F7/2 levels is also observed under near infrared excitation in the 4I9/2 (801 nm) and 4I11/2 (978 nm) multiplets respectively. The upconversion mechanisms are investigated by means of excitation and timeresolved luminescence spectroscopy.
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Rolindes Balda, Mihail Voda, Arantza Mendioroz, Mohamed Al-Saleh, and Joaquin M. Fernandez "Upconversion mechanisms in KPb2Cl5:Er3+ crystal", Proc. SPIE 5350, Optical Components and Materials, (14 June 2004);

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