Sr₂Gd₈(SiO₄)₆O₂:Ce³⁺/Mn²⁺: A Single‐Component White‐Light‐Emitting Phosphor for UV W‐LEDs

Abstract

an oxyapatite structure phosphor, was prepared through a high temperature solid state reaction method. The crystal structure, luminescence properties, and energy transfer mechanism of the samples were investigated in detail. Under the irradiation of 330 nm, tunable colors from blue to yellow, including white can be realized through the energy transfer from Ce 3 + to Mn 2 + ions. The energy transfer mechanism of Ce 3 + ! Mn 2 + was discussed and demonstrated to be a dipole-dipole interaction according to the results of the emission spectra and decay curves of the phosphors. Moreover, the thermal stability of the Ce 3 + and Mn 2 + co-doped Sr 2 Gd 8 (SiO 4 ) 6 O 2 phosphors were studied through the temperature-dependent emission spectra. The results suggest that Sr 2 Gd 8 (SiO 4 ) 6 O 2 :Ce 3 + /Mn 2 + maybe used as color tunable phosphors in white-light-emitting diodes (WLEDs) .

Novel Red‐Emitting Gd3BW1‐xMoxO9 : Eu3+ Phosphor with High Thermal Stability for Application in UV‐Excited WLEDs and Rapid Visualization of Latent Fingerprints

“…One method is based on an InGaN-based blue LED chip with a yellow-emitting phosphor (YAG : Ce 3 + ). Inspite of its wide applications and high luminous efficacy, the major shortcoming of this method is that it is restricted to a high correlated color temperature (CCT > 6000 K) and low color rendering index (Ra < 70) because of the lack of the red spectral contribution in the visible region, [11][12][13][14] which limits its widespread commercialization in the lighting market. The other method for producing WLEDs is through the combination of an ultraviolet (UV) LED chip with multiphased phosphors emitting blue, green, and red light, which has been considered as an effective method to produce warm white light with high color rendering index and low correlated color temperature.…”

Study on Design, Synthesis and Controlled Color Emission of (Gd,Y)AG: Ce3+ Based Phosphors Through Replacing Al3+ Partly

“…[9][10][11][12] A smaller radius of Y 3+ ions (1.019 Å) doping in GdAG phase achieves the lattice stability; (2) the yellow phosphors need to be further improved. The Ga 3+ /Ce 3+ or Mg 2+ /Si 4+ /Ce 3+ co-doped (Gd, Y)AG phosphors with controllable color emission effectively reduced the production blue light composition in white LEDs is too high, and its properties of blue light components, [13][14][15][16] and its fluorescence properties can be significantly improved; (3) replacing Al 3+ with Ga 3+ or Mg 2+ /Si 4+ ions in (Gd, Y)AG results in the changes of crystal coordination field, which realizes the adjustable fluorescence performance of (Gd, Y)AG based phosphors. [17,18] The double substitution of [Mg 2+ ]-(Si 4+ ) for [Al 3+ ]-(Al 3+ ) leads to the lattice constant increasing and achieves the color emission fine-tuning.…”