Luminescent-center tuning for Ba6Ca3YAlSi6O24:Ce3+, Na+ orthosilicate phosphors

• Published in: Journal of alloys and compounds 2019-03, Vol.777, p.572-577
• Main Authors: Yang, Sungjun, Shin, Tae Joo, Park, Sangmoon
• Format: Article
• Language: English
• Subjects: Luminescent center; Orthosilicate; Photoluminescence; X-ray diffraction
• ISSN: 0925-8388; 1873-4669
• DOI: 10.1016/j.jallcom.2018.10.266

Ce3+ ion-doped Ba6Ca3YAlSi6O24 phosphors with a charge-compensating Na+ ion were prepared using a solid-state reaction. Ba6Ca3YAlSi6O24 was structurally characterized using synchrotron X-ray powder diffraction. The emission wavelengths of Ce3+ in different Ba2+ and Ca2+ sites with the distortion index of polyhedrons in the host lattice were calculated. The photoluminescence excitation and emission spectra of the Ce3+-activated phosphors were site-selectively monitored; furthermore, the emission quenching as a function of Ce3+ content in the Ba6-2xCexNaxCa3YAlSi6O24 and Ba6Ca3-2xCexNaxYAlSi6O24 (x = 0.01–0.4) was clearly distinguished at relatively high concentrations of the activator. The Gaussian components of the phosphors were exploited by using the Ce3+ ion sites in the host lattice; in addition, the one and two luminescent centers for the Ba6-2xCexNaxCa3YAlSi6O24 and Ba6Ca3-2xCexNaxYAlSi6O24 phosphors, respectively, were identified. The sites of the luminescent centers for the calculated Ba6Ca3-2xCexNaxYAlSi6O24 composition was selectively tuned as the (BaCa)9-2xCexNaxYAlSi6O24 lattice structure. [Display omitted] •Ba6Ca3YAlSi6O24:Ce3+, Na+ phosphors were prepared.•New phase of the Ba6Ca3YAlSi6O24 host was characterized.•Single and double luminescent centers were identified.•Ba6Ca3-2xCexNaxYAlSi6O24 was tuned as (BaCa)9-2xCexNaxYAlSi6O24.