Color tunable phosphorescence in KY3F10:Tb3+ for x-ray or cathode-ray tubes

Abstract

We report a persistent phosphor of KY3(1−x)Tb3xF10 (KY3F10:xTb3+) synthesized by solid-state reaction for x-ray or cathode-ray tubes. The phosphorescence consists of a group of blue and green emission lines originating from D53→F7J and D54→F7J transitions of Tb3+, respectively. The phosphorescent emitting color can be tuned from blue to green by gradually increasing Tb3+ concentrations, which is attributed to the enhanced D53-D54 relaxation through the cross relaxation between two Tb3+ ions, as described by of (D53,F76)-(D54,F70). The Tb3+ concentration dependent phosphorescence spectra are well simulated based on the analysis of luminescence dynamical processes using the Judd–Ofelt theory and rate equations concerning the D53 and D54 levels. The energy charge and release pattern of the phosphor are presented and a 10% decay time is 29 s. The measurement of the thermoluminescence glow curve gives convincing evidence for the traps analysis.

Judd–Ofelt analysis of Ho3+ doped in ceramic CaSc2O4

“…To overcome this difficulty, various methods to replace the usual absorption spectrum with some equivalents were proposed [3][4][5][6][7][8][9][10][11]. One method consists in embedding the powder in some diluent as transparent epoxy [3] or in KBr [4] and measuring the absorption spectrum.…”

“…For the materials doped with Eu 3 þ , the luminescence spectrum calibrated with the pure magnetic-dipole transition 5 D 0 -5 F 1 was used to obtain the JO parameters [8][9][10]. The lifetime of the 5 D 4 level of Tb 3 þ was used to calibrate the luminescence spectrum [11].…”

Europium Luminescence as a Structural Probe: Structure‐Dependent Changes in Eu3+‐Substituted Th(C2O4)2·xH2O (x = 6, 2, and 0)

“…To calculate the J-O parameters, the average transition energies are obtained from the emission spectrum as an average over the selected transition region [Equation (6)]:…”

“…In particular, lanthanide-doped materials have a prominent place in modern solid-state optical technologies, such as solid-state lasers for industry; [1,2] optical probes for medical diagnosis; [3] environmental monitoring; [4] active optical fibers for telecommunication; [5] phosphors for cathode-ray tubes, [6] displays, [7] and lightning applications; [9] and photocatalysis. [8] From the fundamental point of view, the understanding of the particular physical properties of lanthanide-doped materials is also of interest.…”

Interionic cross relaxation and tunable color luminescence in KY3F10:Tb3+ nano/microcrystals synthesized by hydrothermal approach

“…The fluoride material KY 3 F 10 with the cutoff phonon frequency of 400 cm À1 is applied as a laser material for the good optical and thermomechanical properties [5]. The complex fluorides are conventionally synthesized by crystal growth or solid-state reaction method [6][7][8]. However, such reaction requires high temperature, complicated setup and pure inert atmosphere to avoid contamination from oxygen.…”