Photoconversion, luminescence and vibrational properties of Mn and Mn,Ce doped Tb3Al5O12 garnet single crystalline films

Dewo, Wioletta; Gorbenko, V.; Markovskyi, Anton; Zorenko, Yuriy; Runka, Tomasz

doi:10.1016/j.jlumin.2022.119481

Cited by 2 publications

(1 citation statement)

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“…Figure 5 b illustrates the Raman spectra obtained from the Ce 3+ -doped Tb 3 Al 5−x Sc x O 12 garnet lattice as a function of Sc 3+ ion concentration. In the Ce 3+ -doped Tb 3 Al 5−x Sc x O 12 crystal, where x = 0.5, the characteristic Raman signature of the Tb 3 Al 5 O 12 garnet phase is recognizable, although there is a slight shift to lower energies in the modes’ frequencies compared to those reported in the literature [ 47 ]. To elucidate this observation further, the variation of the A 1g mode peak energy, which occurs at 770 cm −1 in the Tb 2.85 Ce 0.15 Al 4.5 Sc 0.5 O 12 crystal (x = 0.5), is analyzed as Sc 3+ ion concentration increases, as depicted in Figure 5 c. This mode, known for its sensitivity to strain and stress effects in the garnet phase, is significantly distant from the phase matrix’s activity, thereby allowing for a precise fitting procedure [ 48 ].…”

Section: Resultsmentioning

confidence: 96%

Micro-Inclusion Engineering via Sc Incompatibility for Luminescence and Photoconversion Control in Ce3+-Doped Tb3Al5−xScxO12 Garnet

Bartosiewicz,

Tomala,

Szymański

et al. 2024

Materials

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Aluminum garnets display exceptional adaptability in incorporating mismatching elements, thereby facilitating the synthesis of novel materials with tailored properties. This study explored Ce3+-doped Tb3Al5−xScxO12 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 A1g 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 Tb3Al5−xScxO12 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.

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Section: Resultsmentioning

confidence: 96%