Ultraviolet radiation excited strong red-emitting LaAlO 3 :Eu 3+ nanophosphors: Synthesis and luminescent properties

Eu-DOPED La1-xYxAlO₃: IMPACT Of Y/La RATIO ON OPTICAL PROPERTIES

“…The shift in the absorption edge to higher energies with the substitution by a smaller ion into the A-site is consistent with literature [23]. Weaker excitation bands appearing above 360 nm can be assigned to the f-f transitions of the Eu 3+ ions [10,24].…”

“…Moreover, other satellite emission lines appear in the samples with the LaAlO 3 phase or as an effect of the La substitution at the Y site in the YAlO 3 structure. This fact can be explained by the rather different sensitivity to the departures from the site inversion symmetry for the above mentioned Eu 3+ transitions in both the YAlO 3 and LaAlO 3 structures [10,[24][25][26]. Not only does the relative intensity of the individual emission lines change, but the particular transitions are also split into a higher number of bands.…”

Luminescent properties of Eu3+-activated Gd2ZnTiO6 double perovskite red-emitting phosphors for white light-emitting diodes and field emission displays

“…Currently, phosphor-converted white light-emitting diodes (WLEDs) have been extensively adopted in various solid-state lighting applications due to their superior characteristics such as high efficiency, energy saving, long lifetime, and environmental friendliness compared to the conventional incandescent and uorescent light bulbs. [1][2][3][4][5][6][7][8][9][10][11][12][13][14] Commonly, the strategy to design commercial WLEDs is the combination of InGaN blue LEDs and Y 3 Al 5 O 12 :Ce 3+ yellow-emitting phosphors. However, the white light obtained from this conguration possesses a low color rendering index (CRI < 80) due to the lack of red component, leading to the restriction of their use in practical applications.…”

“…[3][4][5] To overcome this issue, new designs for white colors emitted from blends of tricolor (red, green, and blue) phosphors excited by ultraviolet (UV) chips have been developed. [6][7][8][9][10][11][12][13][14] Since these tricolor-phosphors-based WLEDs exhibit excellent CRI (>80) and high conversion efficiency, the exploration of luminescent materials is a big challenge. In particular, although several highly efficient red-emitting phosphors have been investigated, there are still some technical limitations such as complexity in synthetic processes, harsh environment, and high cost.…”

Yellow Emission Obtained by Combination of Broadband Emission and Multi-Peak Emission in Garnet Structure Na2YMg2V3O12: Dy3+ Phosphor

“…One method generates white light by combining yellow phosphors with blue LED chips, such as the yellow phosphor YAG: Ce 3+ [8,9]. However, the absence of the red-emitting component reduces the quality of the white light, yielding poor color reproduction and a low color rendering index (R a ) [10]. The other method stimulates blue, green, and red (RGB) phosphors by violet or ultraviolet light LEDs [11].…”