A novel green-emitting SrCaSiAl2O7:Eu2+ phosphor for white LEDs

Abstract

The crystal structure of a Eu 2+ -activated SrCaSiAl 2 O 7 phosphor was refined and determined as a tetragonal structure with the refinement converged to R p ¼ 7.05%, R wp ¼ 10.67%, and c 2 ¼ 2.637 by Rietveld refinement using a synchrotron light source. By doping different contents of Eu 2+ , the emission peaks gives a range between 526 nm and 535 nm. The estimated Stokes shifts and Commission International de l'Eclairage (CIE) chromaticity coordinates are 16576-16896 cm À1 and (0.3155, 0.5073) to (0.3685, 0.5284), respectively. By tuning the ratio of phosphors and silicone, the optical properties of the three-band white LEDs could be tuned, changing the CIE chromaticity coordinates from yellow (0.4343, 0.4857) to white-light (0.3311, 0.3460), the correlated color temperature (CCT) between 3599 K and 5558 K, and color rendering index (Ra) in the range 83.1 to 79.1, under a forward bias current of 350 mA.

Synthesis, Structure, and Photoluminescence Properties of Ce3+-Doped Ca2YZr2Al3O12: A Novel Garnet Phosphor for White LEDs

“…22 When the coordination number is 8, the radii of Ca 2+ , Ce 3+ , and Y 3+ are 1.12, 1.14 and 1.02 Å, respectively. 25 It can be calculated that the emission peaks of Ce 3+ are 19 930 cm −1 (501 nm) and 18 802 cm −1 (531 nm) when the occupancy site is the Ca 2+ or Y 3+ ion, respectively.…”

Photoluminescence properties of Y0.5−xGd0.35Eu0.15BixNbO4 (0≤x≤0.30) and Y0.35Gd0.35Eu0.15Bi0.15Nb1−yPyO4 (0≤y≤0.20) phosphors

“…It has great potential applications in the fourth generation lightly sources replacing the incandescent and fluorescent lamps [1][2][3][4][5][6][7].…”

Microwave Sol–Gel Synthesis of CaGd2(MoO4)4:Er3+/Yb3+ Phosphors and Their Upconversion Photoluminescence Properties

“…Oxide photoluminescence materials are of great importance in modern photonic technology because of a great diversity of available phosphors with different compositions and spectroscopic properties, high operation durability, and emission efficiency, and a pronounced chemical stability in the air environment . Upconversion (UC) photoluminescence particles, as a new generation fluorecence materials, have a strong ability to convert the near‐infrared radiation with low energy into the visible radiation with higher energy via a nonlinear optical process .…”

“…O XIDE photoluminescence materials are of great importance in modern photonic technology because of a great diversity of available phosphors with different compositions and spectroscopic properties, high operation durability, and emission efficiency, and a pronounced chemical stability in the air environment. [1][2][3][4][5][6][7][8][9] Upconversion (UC) photoluminescence particles, as a new generation fluorecence materials, have a strong ability to convert the near-infrared radiation with low energy into the visible radiation with higher energy via a nonlinear optical process. [10][11][12][13][14][15][16][17] Recently, lanthanide (Ln)-doped UC particles were found to be useful for a wide range of biomedical applications such as biodetection, cancer therapy, biolabeling, fluorescence imaging, magnetic resonance image, and drug delivery.…”