Synthesis, characterization and photoluminescent properties of Sm 3+ /Dy 3+ doped strontium zirconate perovskites
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Synthesis, characterization and photoluminescent properties of Sm3+/Dy3+ doped strontium zirconate perovskites Meenu Venugopal 1 & H. Padma Kumar 2 & R. Jayakrishnan 3 Received: 6 November 2018 / Accepted: 9 March 2020 # Springer Science+Business Media, LLC, part of Springer Nature 2020
Abstract Photoluminescent properties of Sm3+/ Dy3+ single and co-doped SrZrO3 perovskites, prepared through conventional solid state ceramic route method were investigated. X-ray diffraction studies confirmed the orthorhombic (Pnma) perovskite structure of the calcined samples. Dy3+doped SrZrO3 systems showed blue emission at 482 nm and yellow emission at 574 nm due to the transition between 4F9/2-6H15/2 and 4F9/2-6H13/2 levels respectively while Sm3+ doped SrZrO3 systems shows red emissions at around 567 nm, 603 and 646 nm that respectively corresponds to the 4G5/2 → 6H5/2, 4G5/2 → 6H7/2 and 4G5/2 → 6H9/2 transitions of Sm3+. Sm3+/ Dy3+ co-doped SrZrO3 systems shows two different emissions for excitations at 350 nm and 407 nm. Near white light emission was achieved for the SrZr0.9Sm0.025Dy0.075O3, SrZr0.9Sm0.05Dy0.05O3 andSrZr0.9Sm0.075Dy0.025O3 systems at 354 nm excitation with CIE colour co-ordinates (0.3792, 0.3849), (0.3813, 0.3853) and (0.3786, 0.3851) respectively. Keywords Solid state ceramic route . Perovskites . Photoluminescence . SrZrO3
1 Introduction Materials with perovskite structures are gaining wide spread interest among researchers due to their superior physical and chemical properties especially in the fields such as solid oxide fuel cells, electronic devices, phosphor, sensors etc. [1–4]. Among various perovskite type oxides, zirconia based perovskites are getting wide range of appreciation in the research field due to their high chemical and thermal stability, high melting point and small thermal coefficient [5].Strontium zirconate is reported to have high protonic conductivity at high temperatures [6, 7]. Due to this reason zirconia based perovskites now find potential applications in the field of fuel cells, ceramic materials with electronic applications and also refractory materials [7–10]. Along with these electrical properties SrZrO3 perovksites are also reported to be having luminescence
* H. Padma Kumar [email protected] 1
Department of Physics, Mar Ivanios College, Bethany Hills, Nalanchira, Trivandrum, Kerala 695015, India
2
Department of Physics, V.T.M.N.S.S College, Dhanuvachapuram, Thiruvananthapuram, Kerala 695503, India
3
Department of Physics, Christian College, Chengannur, Kerala 689121, India
properties [11]. Zhang et al. had reported that in SrZrO3 due to its structure defect, recombination of electrons in the oxygen vacancies and the holes in valence band takes place and an emission at around 400 nm occurs [12]. Theoretical study in this area had been carried out by Longo et al. [13]. Thus strontium zirconate can also serve as an effective host material in rare earth doped luminescent materials. Among various luminescent materials, rare earth doped perovskites had become one of
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