Preparation And Luminescence Of Borophosphate And Phosphate Phosphors

As a new generation of light source, the white light LEDs absorb intensiveattentions due to its high efficiency, energy saving, environmental protection. Due tothe huge application prospect of white-light LEDs, at present, more and more effortshave been paid to explore and prepare the new luminescent materials for the whitelight LEDs.In this paper, a new kind of borophosphate compound SrCo2BPO7has beenchosen as a matrix of luminescent materials. By solid-state method, this material hasbeen prepared and the luminescence property has been researched by doping variousmetal ions. The results indicate that SrCo2BPO7:Mn2+can emit a broad red light withthe wavelength from550nm to750nm when excited by near UV light. The intensityof light reach to the maximum value as the doping amount is0.3%. At the same time,SrCo2BPO7:Eu2+has a strong narrow blue emission with the peak at465nm. Sincethe strong blue light excited by near UV light, it can be considered as a potential bluephosphor for near UV LEDs.As a new light host material, SrZn2(PO4)2has been prepared by solid statemethod and the luminescent properties have also been investigated by doping variousrare earth ions. The results showed that SrZn2(PO4)2:Eu3+could emit strong orangelight with the main peak at615nm. The fluorescence intensity of this phosphorincreases firstly and then decrease with the doping amount of Eu3+. The best dopingamount of Eu3+is0.5%. As excited at310nm, SrZn2(PO4)2:Ce3+can emit the brightviolet light and the best doping amount is0.3%. SrZn2(PO4)2:Tb3+has a yellow-greenlight emission as excited by near UV light, which can be considered as a potentialgreen phosphor for LEDs. SrZn2(PO4)2:Tb3+can emit yellow light excited at373nmand the emission peak like that of the commercial phosphor YAG:Ce. The fluorescence intensity increase with the doping amount of Pr3+, and the best amount is0.1%.Based on above, several potential phosphors excited by near UV light have beenfound. These results will be helpful for exploring new phosphors of near UV LEDs.