A new Pr³⁺‐activated molybdate‐based phosphor for application to white LEDs with blue excitation

Abstract

The novel red-emitting phosphors K(x)Sr(1-2x)MoO₄:Pr³⁺(x) (0.00 ≤ x ≤ 0.04) were prepared by solid-state reaction. The crystallization and particle sizes of samples were investigated by powder X-ray diffraction (XRD) and transmission electron microscopy (TEM). TEM images were in good agreement with the theoretical calculation data from the XRD patterns. Photoluminescence analysis indicated that there were three excitation peaks under 430-500 nm, and all samples showed the intensely red emission at 648 nm corresponding to the ³P₀ → ³F₂ transition of Pr³⁺. The concentrations of doping ions, temperature and polyethylene glycol in the phosphor system can significantly influence the intensity of the red emission. The photoluminescence spectral intensity reached its maximum at x = 0.02. The results showed that the investigated phosphor is a potential red phosphor for white light-emitting diodes.

Structural refinement, growth process, photoluminescence and photocatalytic properties of (Ba1-xPr2x/3)WO4 crystals synthesized by the coprecipitation method

“…These results are in agreement with other research reported in the literature for KSrMoO 4 :Pr 3+ and BaMoO 4 :Pr 3+ . 103,104 Fig. 9(a) shows that the increase in the replacement of Ba 2+ by Pr 3+ ions (x = 0.02) promotes enhanced wide band intensity PL emission.…”

Effect of cation vacancies on the crystal structure and luminescent properties of Ca 0.85−1.5x Gd x Eu 0.1 □ 0.05+0.5x WO 4 (0 ≤ x ≤ 0.567) scheelite-based red phosphors

“…The structure can accommodate a variety of chemical species in both A-and B-cation sublattices, which gives rise to a plethora of different compounds with a general composition (A',A'')a[(B',B'')O4]b, where A', A'' can be alkali, alkali-earth or rare-earth cations and B', B'' are typically W 6+ , Mo 6+ or other cations with tetrahedral coordination. Scheelites containing rare-earth cations demonstrate luminescent properties and can be used in pc-WLEDs (phosphor-converted white-light-emitting-diode) [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15].…”

Development of long‐persistent photoluminescent epoxy resin immobilized with europium (II)‐doped strontium aluminate

“…Those long‐persistence inorganic phosphors are characterized by excellent chemical, photostability, and thermal stability, nontoxicity, high brightness, long time phosphorescence (>10 h), the ability to be recycled, reversibility, nonradioactivity, and quantum efficiency . Such long‐lasting inorganic lanthanide‐doped phosphors have been used in manufacturing several commercial products such as guide marks, ornamental goods, photoluminous indicator, table clothing, switches, and toys . Among these long‐persistent phosphors, the lanthanide‐doped strontium aluminium oxide complex (SrAl 2 O 4 :Eu 2+ ,Dy 3+ ) proved to be an outstanding long‐persistent phosphor due to its high brightness and longer persistence time, as well as its chemical, physical, thermal, and photostability .…”