Wydział Chemii

Karol Bartosiewicz

Robert Tomala

Damian Szymański

Benedetta Albini

Justyna Zeler

Masao Yoshino

Takahiko Horiai

Paweł Socha

Shunsuke Kurosawa

Kei Kamada

Pietro Galinetto

Eugeniusz Zych

Akira Yoshikawa

2024

Materials

17

2762/1-2762/26

10.3390/ma17112762

Naukowa

Angielski

Artykuł

Aluminum garnets display exceptional adaptability in incorporating mismatching elements, thereby facilitating the synthesis of novel materials with tailored properties. This study explored Ce³⁺-doped Tb₃Al_5−xSc_xO₁₂ crystals (where x ranges from 0.5 to 3.0), revealing a novel approach to control luminescence and photoconversion through atomic size mismatch engineering. Raman spectroscopy confirmed the coexistence of garnet and perovskite phases, with Sc substitution significantly influencing the garnet lattice and induced A_1g mode softening up to Sc concentration x = 2.0. The Sc atoms controlled sub-eutectic inclusion formation, creating efficient light scattering centers and unveiling a compositional threshold for octahedral site saturation. This modulation enabled the control of energy transfer dynamics between Ce³⁺ and Tb³⁺ ions, enhancing luminescence and mitigating quenching. The Sc admixing process regulated luminous efficacy (LE), color rendering index (CRI), and correlated color temperature (CCT), with adjustments in CRI from 68 to 84 and CCT from 3545 K to 12,958 K. The Ce³⁺-doped Tb₃Al_5−xSc_xO₁₂ crystal (where x = 2.0) achieved the highest LE of 114.6 lm/W and emitted light at a CCT of 4942 K, similar to daylight white. This approach enables the design and development of functional materials with tailored optical properties applicable to lighting technology, persistent phosphors, scintillators, and storage phosphors.

energy transfer, Ce3+ luminescence, Tb3+ luminescence, photoconversion, white LED, Raman spectroscopy, thermoluminescence, single crystal, garnet, perovskite

CC-BY

http://dx.doi.org/10.3390/ma17112762

http://www.mdpi.com/journal/metals