Luminescence of AlN:Eu Ceramics: Properties and Mechanisms
Optical Materials 2022
Baiba Bērziņa, Rihards Ruska, Jānis Cipa, Laima Trinklere, Anatolijs Sarakovskis, Jānis Grabis, Ints Šteins

Luminescence processes of AlN:Eu ceramics, prepared by high temperature spark plasma sintering method, were studied basing on material spectral characterization by measuring of photoluminescence and excitation spectra at different fixed temperatures within a region from 10 K up to room temperature, together with measurement of luminescence kinetics. In this material the Eu2+ ion emission at 530 nm is dominant, besides, a weak Eu3+ ion emission also is observed at ~600 nm. Two main spectral regions for excitation of Eu2+ emission are located around 360 nm and 260 nm. Analysis of the results obtained demonstrates a presence of two luminescence mechanisms, which are originating the 530 nm emission. It was found that the 530 nm emission caused by 360 nm excitation represents the intra-center mechanism of Eu2+ ion luminescence, whereas the 260 nm exciting light is causing the recombination luminescence. The mechanism of the tunneling recombination luminescence is proposed. Regarding to Eu3+ ions, an excitation line at 464 nm was found that together with the 614 nm emission represents the intra-center luminescence. The persistent luminescence caused by Eu ions in AlN lasting within a time scale of hours is revealed.

Europium doped aluminum nitride ceramics Photoluminescence and excitation spectra Luminescence mechanisms Persistent luminescence

Bērziņa, B., Ruska, R., Cipa, J., Trinklere, L., Sarakovskis, A., Grabis, J., Šteins, I. Luminescence of AlN:Eu Ceramics: Properties and Mechanisms. Optical Materials, 2022, Vol. 127,Article number 112217. ISSN 0925-3467. Available from: doi:10.1016/j.optmat.2022.112217

Publication language
English (en)
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