Morphology control of uniform CaMoO₄microarchitectures and development of white light emitting phosphors by Ln doping (Ln = Dy³⁺, Eu³⁺)

Abstract

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Fabrication of Luminescent Antireflective Coatings with CaMoO4:Eu3+/Ag Composite Structure

“…This result may imply that the Eu 3+ ions are located in the site without inversion symmetry. A similar phenomenon has been observed in many CaMoO 4 :Eu 3+ samples, as reported in the literature [9,28,30]. One possible explanation for this discrepancy is given by considering the polarizability effect of the MoO 4 units on the EuO 8 units [28].…”

Revealing the substitution mechanism in Eu3+:CaMoO4and Eu3+,Na+:CaMoO4phosphors

“…The excellent luminescent properties together with the high chemical and thermal stability of the CaMoO4:Eu 3+ phosphor has attracted a lot of attention in the last decade. Photoluminescence properties of CaMoO4:Eu 3+ have been extensively studied in bulk samples, 5,6,7,8 microparticles 3,9,10,11 and different types of nanoparticles. 12,13,14,15 However, very little attention has been paid to the substitution mechanism and crystal structure of Eu 3+ :CaMoO4 phosphors.…”

Microemulsion‐Mediated Synthesis and Properties of Uniform Ln:CaWO4 (Ln = Eu, Dy) Nanophosphors with Multicolor Luminescence for Optical and CT Imaging

“…The decay curves obtained for the I(t) = I 01 exp(-t/τ 1 ) + I 02 exp(-t/τ 2 ) (1) where I(t) is the luminescence intensity, t is the time after excitation, and τ i (i = 1, 2) is the decay time of the i-component, with initial intensity I 01 . Such biexponential behavior has been previously observed for this system [35,37] and other lanthanidebased nanophosphors [38] and accounts for the contribution of the Eu 3+ ions located close to the surface of the nanoparticles (short time component) whose luminescence is influenced by OH species or surface defects that act as luminescence quench- [38] The fitting parameters are presented in Table 4, which shows that the short-time component is a minority in all cases and that the lifetime values tend to decrease as the Eu doping level increases. This variation is also manifested by the average lifetime values, <τ>, calculated from Equation (2): (2) where t f represents the time required for the luminescence signal to reach the background.…”