Luminescence and energy transfer in Lu3Al5O12 scintillators co-doped with Ce3+ and Pr3+

Thermal ionization and thermally activated crossover quenching processes for5d−4fluminescence inY3AlUeda1, Meijerink2, Dorenbos3 et al. 2017Phys. Rev. B752420View full textAdd to dashboardCite

“…To provide a better understanding of the quenching processes of the 5d-4f luminescence, the family of garnet Ln 3 M 5 O 12 (Ln = Gd, Y, Lu; M = Sc, Al, Ga) doped with Ce 3+ and Pr 3+ serve as important model systems because of the possibility to tune optical properties as a function of covalency, size of the cation site, bandgap, vibrational energies, etc., by variation of the ions on the three different cation sites in the garnet hosts [5,[10][11][12][13]. In the past, we have focused on the garnet materials doped with Ce 3+ for the analysis of the quenching mechanisms and for the development of persistent phosphors [14][15][16][17] (LuAG), precise configuration coordinate diagrams were constructed from low-temperature spectroscopy data and the 5d-4f thermal quenching behavior was related to the energy gap between the lowest 5d 1 state and the next lower 4f state [10].…”

VUV-vis photoluminescence, X-ray radioluminescence and energy transfer dynamics of Ce3+ and Pr3+ doped LiCaBO3

“…a large energy gap between the bottom of the conduction band and the relaxed lowest 5d state of Ce 3+ . 48,49 The luminescence decay curve (l ex = 245 nm, l em = 278 nm) of Li 1.003 Ca 0.994 Pr 0.003 BO 3 at RT is displayed in Fig. 9 using the method reported in ref.…”

CHALLENGES IN APPLICATION OF LUMINESCENT MATERIALS, A TUTORIAL OVERVIEW (Invited Review)

“…Garnets show light yields up to 60000 ph/MeV and when doped with Ce 3+ their primary decay time when excited with ionizing radiation is smaller than 100 ns, beit that in many cases longer decay components due to the presence of shallow traps and afterglow as a consequence of the presence of deep traps is observed. It is also observed that the luminescence properties and the light yield strongly depend on the material composition, see, f.e., [22][23][24][25][26][27][28][29]. Both (Y,Gd) 2 O 3 :Eu and the garnets are cubic, and transparent ceramic material can be obtained without the need for single crystal growth.…”

“…A potential way out is the use of cubic materials that can be sintered to transparency, this strongly reduces processing costs. The cubic garnet type of materials doped with Ce 3+ , also used in LEDs, are potentially suitable for application in (TOF)-PET and to this end are investigated by many different groups, both in academia and companies, see, a.o., [22][23][24][25][26][27][28][29] Afterglow will lead to additional triggering of the PET counting system, without the detection of two simultaneously generated γ-quanta. The stopping power is also important for the spatial resolution of TOF-PET.…”

“…Variations in the lattice potential are also expected to reduce the mobility of the excited particles. Interestingly, there is much focus on garnets containing a lot of different metal ions, as this improves the overall energy efficiency, see, e.g., [22][23][24][25][26][27][28][29], this may come with a compromise in terms of energy resolution.…”