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.


Atslēgas vārdi
Europium doped aluminum nitride ceramics Photoluminescence and excitation spectra Luminescence mechanisms Persistent luminescence
DOI
10.1016/j.optmat.2022.112217
Hipersaite
https://www.sciencedirect.com/science/article/pii/S0925346722002518?via%3Dihub

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

Publikācijas valoda
English (en)
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