Luminescence properties of Dy3+-doped Li2SrSiO4 for NUV-excited white LEDs

Ionic Liquid‐Assisted Route to Nanocrystalline Single‐Phase Phosphors for White Light‐Emitting Diodes

“…6 H 13/2 transition and Y/B ratios of 1.5-1.8. A Y/B ratio of 1.2-0.6 has been found in oxyfluoride glasses, [24] a value of 0.75 in NaCaPO 4 [26] and of 0.5 in Li 2 SrSiO 4 , [25] which indeed feature a (considerably) higher local symmetry compared to Dy 3 + in LaF 3 . Thus, the color change documented by the calculation of the CIE (Commission internationale de l'Eclairage) chromaticity color coordinates [28] when going from the 355 nm excitation to the 356 nm excitation with color coordinates of 0.302 (x)/0.322 (y) and 0.317 (x)/0.343 (y), respectively.…”

“…Emission spectra with the excitation wavelength varied between 350 and 360 nm were recorded (Figure 3). Interestingly, the ratio of the Tm [25,26] In LaF 3 , Dy 3 + substitutes a La 3 + position, giving the dopant Dy 3 + ion a C 2 site symmetry. [27] This low symmetry is in agreement with the dominance of the yellow 4 F 9 !…”

White light emission from Ca9Bi(PO4)7:Dy3+ single-phase phosphors for light-emitting diodes

“…All the measurements were performed at room temperature. ions [10]. The profiles and positions of these excitation peaks were not significantly 100 affected by various concentrations of Dy 3+ ions owing to the 4f 9 electronic 101 configuration of Dy 3+ ions, and some strong excitation bands located at 350-410 nm 102 wavelength range indicate that Dy 3+ is significant for NUV WLEDs.…”

“…It is well 37 known that appropriate hosts doped with Dy 3+ ions can emit white light because of 38 their principal emissions in the blue and yellow regions, corresponding to the 39 4 F 9/2 → 6 H 15/2 and 4 F 9/2 → 6 H 13/2 transitions. This method has attracted much attention 40 because of its capability of white-light emission in a single host [8][9][10][11]. 41 Although the single-phase full-color emitting phosphors for NUV-pumped WLED M A N U S C R I P T A C C E P T E D analyzed using a D/MAX2500TC X-ray powder diffractometer.…”

Preparation and luminescence property of Eu2+, Mn2+ co-doped silicates phosphors for white LED

“…It is well known that silicates are usually good choice for many luminescent materials due to their good physical and chemical stability and excellent optical properties [9][10][11] Recently, the luminescent properties of rare-earth ion doped silicates phosphors have been extensively investigated because of their potential applications in white LEDs [ 12,13]. Kim [17].…”