Tb 3+ to Eu 3+ Energy Transfer in the Design of Optical Materials

Résumé fourni par la source

Tb 3+ → Eu 3+ energy transfer process has been broadly investigated and exploited in inorganic-based materials to design efficient luminescent compounds emitting in the visible spectral region for the development of optical devices based on innovative phosphors [1, 2, 3]. In this context, the efficiency of this process strongly impacts the ratio between the Tb 3+ emission (in the green) and the red emission of Eu 3+ , so as to tune the emission color of the phosphor, for example by changing the concentration of the latter ion (Figure 1). ( put here Figure 1 ) In this contribution, several examples of Tb 3+ → Eu 3+ energy transfer in representative inorganic host materials will be analyzed and discussed. In particular, we will focus our attention on Eu 3+ doped cubic A 3 Tb(PO 4 ) 3 (A = Sr, Ba) [4], trigonal TbAl 3 (BO 3 ) 4 [5, 6] and trigonal TbPO 4 [7] compounds. The chiroptical activity exhibited by the latter sample can be conveniently exploited for the design of optical materials for advanced applications ( i.e. in the field of anti-counterfeiting). References [1]W.W. Holloway Jr., J.M. Kestigian, R. Newman, Direct evidence for energy transfer between rare earth ions in terbium-europium tungstates, Phys. Rev. Lett. 11 (1963) 458–460. [2] M. Bettinelli, C.D. Flint, Non-resonant energy transfer between Tb 3+ and Eu 3+ in the cubic hexachloroelpasolite crystals Cs 2 NaTb 1-x Eu x Cl 6 (x=0.01-0.15), J. Phys. Condens. Matter 2 (1990) 8417–8426. [3] I. Carrasco, F. Piccinelli, M. Bettinelli, Luminescence of Tb-based materials doped with Eu 3+ : case studies for energy transfer processes, J. Lumin. 189 (2017) 71–77. [4] A. N. Carneiro Neto, R. T. Moura Jr., A. Shyichuk, V. Paterlini, F. Piccinelli, M. Bettinelli, O. L. Malta, Theoretical and Experimental Investigation of the Tb 3+ → Eu 3+ energy transfer mechanisms in cubic A 3 Tb 0.90 Eu 0.10 (PO 4 ) 3 (A = Sr, Ba) materials, J. Phys. Chem. C 2020, 124, 10105-10116. [5] S. Ruggieri, L. Ceccon, M. Bettinelli, F. Piccinelli, Excited state dynamics of undoped and Eu 3+ -doped TbAl 3 (BO 3 ) 4 crystals, ECS J. Solid State Sci. Technol. 12 (2023) 066005. [6] L. Ceccon, S. Ruggieri, M. Bettinelli, I. R. Martin, F. Piccinelli, Tb 3+ → Eu 3 + energy transfer processes in crystals of TbAl 3 (BO 3 ) 4 doped with Eu 3+ , Ceramics International , in press. [7] L. Ceccon, E. Cavalli, S. Ruggieri, M. Bettinelli, F. Piccinelli, Circularly polarized luminescence from pure and Eu-doped trigonal TbPO 4 · n H 2 O nanocrystals, Inorg. Chem. 2024, 63, 13636-13643. Figure 1

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