Thermal quenching properties of narrow-band blue-emitting MBe₂(PO₄)₂:Eu²⁺(M = Ca, Sr) phosphors towards backlight display applications

Abstract

Narrow-band blue-emitting MBe2(PO4)2:Eu2+ (M = Ca, Sr) phosphors were developed via selection of an ordered host with confined doping sites.

Eu2+Stabilized at Octahedrally Coordinated Ln3+Site Enabling Red Emission in Sr3LnAl2O7.5(Ln = Y or Lu) Phosphors

“…[ 16–17 ] Identical emission behaviors were found in our previously studied narrow‐band MBe 2 (PO 4 ) 2 :Eu 2+ (M = Ca, Sr) phosphors, wherein Eu 2+ is located at the larger Sr 2+ site, showing narrower emission, smaller Stokes shift, and higher emission energy as compared to that of Eu 2+ at the Ca 2+ site. [ 18 ]…”

“…[16][17] Identical emission behaviors were found in our previously studied narrow-band MBe 2 (PO 4 ) 2 :Eu 2+ (M = Ca, Sr) phosphors, wherein Eu 2+ is located at the larger Sr 2+ site, showing narrower emission, smaller Stokes shift, and higher emission energy as compared to that of Eu 2+ at the Ca 2+ site. [18] To thoroughly identify the Eu 2+ site occupancy, low-temperature PL spectra were recorded at 10 K to avoid thermal broadening or emission thermal quenching at room temperature. The excitation wavelength was chosen to be 350 nm UV light as it can generally excite all doped Eu 2+ in the lattice.…”

Thermally Stable Tb3+/Eu3+-Codoped K0.3Bi0.7F2.4 Nanoparticles with Multicolor Luminescence for White-Light-Emitting Diodes

“…Luminescent materials doped with rare-earth ions, which have the ability to convert incident light into abundant emissions, have been largely investigated in many fields including photocatalysis, fluorescent lamps, optical thermometry, in vivo imaging, and so forth. − Particularly, considerable interest in the phosphor-based white-light-emitting diode (white-LED), which is recognized as the fourth-generation solid-state lighting source, has been gained on account of its inherent characteristics, such as small size, high luminous efficiency, non-pollution, and low-energy consumption. , In terms of the phosphor-converted white-LED, its electroluminescence (EL) behaviors are greatly impacted by phosphors. At present, the utilization of a blue-emitting lnGaN chip to pump Y 3 Al 5 O 12 /Ce 3+ yellow-emitting phosphors is the commercial strategy to achieve a white-LED, whereas only the cold white light, in which its color-rendering index (CRI) is low and corrected color temperature (CCT) is high, is able to be generated by applying this route because of the insufficient red component. , In order to figure out these shortages, researchers have tried to use a near-ultraviolet (NUV) chip to pump multicolor-tunable (e.g., blue–green–red, blue–yellow, and so on) phosphors so as to obtain high-performance white-LEDs. , However, owing to the unsatisfied luminescent behaviors of these multicolor-tunable phosphors, the luminous efficiency of the packaged white-LED is still not high enough.…”

“…1−5 Particularly, considerable interest in the phosphor-based white-light-emitting diode (white-LED), which is recognized as the fourth-generation solid-state lighting source, has been gained on account of its inherent characteristics, such as small size, high luminous efficiency, non-pollution, and low-energy consumption. 6,7 In terms of the phosphor-converted white-LED, its electroluminescence (EL) behaviors are greatly impacted by phosphors. At present, the utilization of a blue-emitting lnGaN chip to pump Y 3 Al 5 O 12 /Ce 3+ yellow-emitting phosphors is the commercial strategy to achieve a white-LED, whereas only the cold white light, in which its color-rendering index (CRI) is low and corrected color temperature (CCT) is high, is able to be generated by applying this route because of the insufficient red component.…”

Enhanced luminescence properties of Ca1+xSr2−xAl2O6:Eu3+ (0 ≤ x ≤ 1) red phosphors based on composition modulation

“…In the last few decades, white light-emitting diodes (WLEDs) have been widely studied, owing to their typical advantages such as long lifetime, high luminous efficiency, small volume, high brightness, being environmentally friendly and having an excellent stability, and they are considered as the fourth generation of all-solid-state green lighting sources. [1][2][3][4][5][6][7] Currently, the most common way to fabricate commercial WLEDs is by combining a blue InGaN LED chip with a YAG:Ce 3+ (Y 3 Al 5 O 12 :Ce 3+ ) yellow-emitting phosphor. [8][9][10][11] Nonetheless, owing to the deciency of the red-emitting component, the devices have some disadvantages, such as a high correlated color temperature (CCT) and a poor color rendering index (CRI).…”