Reduction of Eu3+ to Eu2+ in NaCaPO4:Eu phosphors prepared in a non-reducing atmosphere

Luminescence and energy transfer of Eu3+ or/and Dy3+ co-doped in Sr3AlO4F phosphors with NUV excitation for WLEDs

“…Most lighting specifications refer to color in terms of the 1931 CIE chromatic color coordinates, which recognize that the human visual system uses three primary colors: red, green and blue [30]. In general, the color of any light source can be represented as (x, y) coordinates in this color space.…”

New NaSrPO4:Sm3+ phosphor as orange-red emitting material

“…Several studies have reported on phosphors which emit blue or green light under UV light irradiation, such as KSrPO 4 :Eu 2+ [2,6], KSrPO 4 :Tb 3+ [6,7], LiSrPO 4 :Eu 2+ [8], NaCaPO 4 :Eu 2+ [9], KBaPO 4 :Eu 2+ [10] and KMgPO 4 :Eu 2+ [11] phosphors. However, red-emitting phosphors excited by NUV spectral region are lacking, and a novel red phosphor with the desired wavelength is needed.…”

A study of the luminescence in near UV-pumped red-emitting novel Eu3+-doped Ba3Ca3(PO4)4 phosphors for white light emitting diodes

“…A series of rare-earth ions doped phosphate host phosphors such as KCaPO 4 [15], NaCaPO 4 [16], NaBaPO 4 [17], SrMg 2 (PO 4 ) 2 [18], BaCaP 4 O 12 [19], Ba 1.6 Ca 0.4 P 2 O 9 [20] and others have been reported. Recently, several methods have been employed for the synthesis of polycrystalline phosphors in nanoscale: co-precipitation method [21], combustion method [22], sol-gel method [23] and others.…”