Color tuning in CaZrO3:RE3+ perovskite by choice of rare earth ion

Effects of Codoping on Site-Dependent Eu3+ Luminescence in Perovskite-Type Calcium Zirconate and Hafnate

“…In perovskite-type oxides (ABO 3 ), the doping technique plays an important role to convert them into various functional materials. − Calcium zirconate, CaZrO 3 (CZO), is one of the perovskite-type oxides, and lanthanide (Ln) ions are frequently doped into CZO to utilize it as an ionic conductor, a phosphor, a pigment, and a scintillator. − Because the size of Ln ions is relatively large, they are expected to replace Ca ions at A sites in CZO. Actually, Tb 3+ ions were found to locate primarily at A sites in Tb 3+ -doped CZO (CZO:Tb 3+ ), and CZO:Tb 3+ showed green photoluminescence (PL) .…”

“…Actually, Tb 3+ ions were found to locate primarily at A sites in Tb 3+ -doped CZO (CZO:Tb 3+ ), and CZO:Tb 3+ showed green photoluminescence (PL) . Similarly, CZO:Eu 3+ has been reported to show red PL in several papers considering that Eu 3+ ions are located at A sites substituting for Ca ions. − However, some papers have proposed that Eu 3+ ions are located at both A and B sites or mainly at B sites replacing Zr ions with oxygen vacancies. − Therefore, the occupation sites of Ln ions and the PL properties in CZO:Ln have not been sufficiently understood yet.…”

Unraveling the site-specific energy transfer driven tunable emission characteristics of Eu3+ & Tb3+ co-doped Ca10(PO4)6F2 phosphors

“…The emission spectra consist of various emission peaks due to Eu 3+ and Tb 3+ ions. The emission peaks around 590, 618, and 704 nm are due to the 5 D 0 → 7 F j ( j = 1, 2, 3 and 4) transitions of Eu 3+ ion 35 while the emission bands at 487, 547, 586 and 621 nm are due toTb 3+ ion's 5 D 4 → 7 J j ( j = 6, 5, 4, 3) transitions. 33 As it is known that for Eu 3+ ion, the emission at 590 nm ( 5 D 0 – 7 F 1 transition) is a magnetic dipole (MD) transition while the red color emission around 618 nm ( 5 D 0 – 7 F 2 transition) and at 704 nm ( 5 D 0 – 7 F 4 transition) are electric dipole (ED) transitions.…”

Synthesis and Characterization of Ca1–xEuxZrO3 as Environmentally Friendly Inorganic Yellow Pigments

“…In this study, we selected perovskite-type calcium zirconate (CaZrO 3 ) as a host material for the environmentally friendly yellow pigment, which is composed of only nontoxic elements. In addition, CaZrO 3 has a high melting point ( T m = 2365 °C) and sufficient chemical stability. , Hence, this compound is well-known as a mother for rare-earth-doped phosphors, such as CaZrO 3 :RE 3+ (RE 3+ = Sm 3+ , Eu 3+ , Gd 3+ , Tb 3+ , and Tm 3+ ). − When Eu 2+ is doped into the Ca 2+ site, the crystal field around the Eu 2+ ion should be strong because the ionic radius of Ca 2+ (0.112 nm for 8 coordination) is smaller than that of Eu 2+ (0.125 nm for 8 coordination) . As a result, the crystal field splitting of the 5d orbitals of Eu 2+ becomes large, and the transition energy of Eu 2+ from the 4f to 5d orbitals is expected to be small, corresponding to the wavelength of visible light.…”