UV-to-red relaxation pathways in CaTiO3:Pr3+

Journal article (2005)

Authors

P Boutinaud External organisation
E Pinel External organisation
M Dubois External organisation
AP Vink External organisation
P. Dorenbos RST/Biomedical Imaging - AS
Research Group
RST/Biomedical Imaging (AS) (TU Delft)
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Published Date

2005

Language

Undefined/Unknown

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Faculty

Applied Sciences

Department

RST/Radiation, Science and Technology

Research Group

RST/Biomedical Imaging

Abstract

The radiationless relaxation pathways leading to the quenching of 3P0 emission and subsequent atypical single red luminescence from 1D2 level in CaTiO3:Pr3+ are studied under UV excitation. Self-trapped excitons are shown to participate in the relaxation process and Pr3+/Ti4+Pr4+/Ti3+ charge transfer state (CTS) is proposed as the final relaxation channel to the emitting 1D2 level. This mechanism is supported by EPR investigations showing an increase of paramagnetic [Pr4+Ti3+O3]+ clusters upon optical excitation in the CTS.

Keywords: CaTiO3:Pr3+; Charge transfer states; EPR; Excitons; Photoluminescence; Relaxation

PACS: 78.55.Hx; 76.30.Kg