Preparation and luminescence properties of Tb³⁺‐doped garnet Y₂Mg₂Al₂Si₂O₁₂ luminescent materials

Abstract

We prepared Y2Mg2Al2Si2O12:xTb3+ (x = 0.02, 0.04, 0.06, 0.08, 0.10, 0.12, 0.14 and 0.16) luminescent materials using a nodulizing procedure. The phase and luminescence properties of these materials were investigated. X‐ray diffraction results demonstrated that Tb3+ ions doped into Y2Mg2Al2Si2O12 hosts successfully and the Y2Mg2Al2Si2O12:xTb3+ materials showed a pure cubic phase. Y2Mg2Al2Si2O12:xTb3+ materials had the characteristic Tb3+ emission bands derived from 5D4→7F6, 7F5, 7F4, and 7F3 transitions when excited at 365 nm. The green emission band that derived from the 5D4→7F5 transition was highest due to the high possibility of both electric‐dipole and magnetic‐dipole transitions. Emission spectra indicated that the critical concentration of Tb3+ in the Y2Mg2Al2Si2O12 host was 0.14. The concentration quenching of Y2Mg2Al2Si2O12:Tb3+ was derived from a dipole–dipole interaction.

A Study of Tb3+ → Eu3+ Energy Transfer in Tb3+/Eu3+ Codoped Y2Mg2Al2Si2O12 Phosphors

“…4B where I t and I 0 are the emission intensities at time of t and 0, and τ is the lifetime. 20,34 The lifetimes are displayed in Table I. From the lifetimes, the energy transfer efficiencies (η t ) from Tb 3+ to Eu 3+ could be obtained via the formula written as η τ τ = − / 1 , t s s 0 where τ s and τ s0 are lifetimes of Tb 3+ emission with and without Eu 3+ .…”

“…22 And to overcome a few of drawbacks of Y 3 Al 5 O 12 :Ce 3+ , a series of garnet-structure phosphor were designed by substitutions of cation sites in Y 3 Al 5 O 12 , which modifies the mineral structure and tunes the local structure. 23 34 we fixed the Tb 3+ concentration as 0.14 and changed the Eu 3+ concentration in Tb 3+ /Eu 3+ codoped Y 2 Mg 2 Al 2 Si 2 O 12 phosphors to investigate the Tb 3+ → Eu 3+ energy transfer. On the grounds of stoichiometric amounts, the starting materials were weighted and grinded in a glass mortar.…”