Luminescent Properties of BaMgAl10O17: Eu2+ Phosphors Coated with Y2SiO5

Enhanced Optical Performance of BaMgAl10O17:Eu2+ Phosphor by a Novel Method of Carbon Coating

“…Up to now, several inorganic materials have been reported as the coating materials such as SiO 2 , MgO, Al 2 O 3 , AlPO 4 , and LaPO 4 and so forth. [14][15][16][17] It is well known that Eu 2+ is easily oxidized to Eu 3+ , and all the materials mentioned above are oxides. Compared with carbon, these materials are more likely to support an oxygen transportation channel and oxidize the luminescence centers Eu 2+ , which contributes to luminescence degradation at higher treatment temperature.…”

“…So far, many researchers have tried to enhance the oxidation resistance at high temperature of BAM phosphor, and many methods, such as coating, codoping, compositional variation, and annealing in a nonoxidizing atmosphere, have been proposed. ,− Among these methods, covering the phosphor particle surface with a coating is an effectively applied technique to enhance the chemical stability of BAM phosphor. Up to now, several inorganic materials have been reported as coating materials such as SiO 2 , MgO, Al 2 O 3 , AlPO 4 , and LaPO 4 . − It is well-known that Eu 2+ is easily oxidized to Eu 3+ , and all the materials mentioned above are oxides. Compared with carbon, these materials are more likely to support an oxygen transportation channel and oxidize the luminescence centers Eu 2+ , which contributes to luminescence degradation at higher treatment temperature.…”

Luminescent properties of BaMgAl10O17:Eu2+ blue phosphor grown with SiO2 using atomic layer deposition

“…Several works have been done to solve these problems. To avoid phosphor degradation, coating the phosphor surface with oxide such as MgO [3], SiO 2 [4] and Y 2 SiO 5 [5] using a sol-gel process has been reported. However, the sol-gel process showed some problems such as the surface of the coated phosphor was not uniform, and also highly defective, resulting in a decrease of luminescent efficiency in spite of excellent passivation.…”

Effects of the pH Level on the Phosphor Characteristics of Zn2SiO4:Mn2+ Coated with SiO2 Nanoparticles

“…here have been various intensive efforts [1][2][3][4][5] to improve the poor characteristics of the luminance and the life span of the phosphors. The surface modification for improving the phosphor characteristics has been done for In 2 O 3 , 6) Y 2 SiO 5 , 7) and Y 2 O 3 . 8) For the purpose of both increasing the luminance and preventing the degradation of phosphors, several studies 1,5,9) regarding the surface treatment have been reported.…”

“…1) The modified sol-gel method used for the surface treatment of phosphors is known to be a simple process, 10) compared to other chemical methods. 2,[6][7][8][9] In order to obtain the phosphors with better luminance performance, we prepared the Zn 2 SiO 4 :Mn 2þ phosphors coated with SiO 2 nano-particles by using the modified sol-gel method under different pH level condotions and investigated their optical properties.…”