Preparation method of luminescent glass/glass-ceramics for light-emitting diodes
A technology of light-emitting diodes and glass-ceramics, applied in the field of light-emitting materials, can solve the problems of complex composition of the base glass, difficult to adjust the light-emitting color, and high preparation temperature, and achieve the effects of stable light-emitting properties, alleviation of heat dissipation problems, and high transparency.
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[0022] The preparation process of the light-emitting glass used for light-emitting diodes in the present invention is as follows:
[0023] Based on CaO-Na 2 O-P 2 o 5 Add the oxides of luminescent ions to the raw material of the basic glass of the system, raise the temperature to 800-1200°C and keep it for 0.5-3h to obtain a clear and uniform glass melt; pour the melt into a stainless steel mold at 300-400°C and quench it to obtain a shaped glass; Heat the molded glass at 400-550°C for 15min-3h, and cool it down to room temperature with the furnace to make luminescent glass. The luminescent glass of the present invention has high transparency, high luminous efficiency and stable luminous properties, can be effectively excited by ultraviolet and visible light, has good luminous matching with LED chips, and can adjust the luminescent color by changing the type and concentration of luminescent ions incorporated.
[0024] For the luminescent glass used for light-emitting diodes...
Embodiment 1
[0029] CaCO 3 、Na 2 O, (NH 4 ) 2 HPO 4 、Eu 2 o 3 As raw material, according to CaO: Na 2 O:P 2 o 5 The molar ratio of Eu is 1:0.1:7.5, and Eu 3+ The molar concentration of external mixing is 1%, and the raw materials are accurately weighed, mixed and ground evenly. The homogeneously mixed raw materials were kept at 800°C for 3 hours, then poured into a stainless steel mold preheated to 300°C for cooling and forming, and then kept at 550°C for 15 minutes and then cooled with the furnace to obtain a luminous glass. Heat the luminescent glass from room temperature to 450°C and keep it warm for 1h, take it out, put it in a high-temperature furnace at 600°C for 1h, and then cool it with the furnace to obtain a luminescent glass-ceramic, whose crystal phase composition is Ca 2 P 2 o 7 , Ca 2 P 6 o 17 and NaCaPO 4 . Under the excitation of 396nm ultraviolet light, its emission spectrum includes red emission at 614nm and orange emission at 587nm, corresponding to Eu ...
Embodiment 2
[0031] CaCO 3 、Na 2 O, (NH 4 ) 2 HPO 4 , Tb 4 o 7 As raw material, according to CaO: Na 2 O:P 2 o 5 The molar ratio of Tb is 2.5:0.7:6, and Tb 3+ The molar concentration of external mixing is 0.5%, and the raw materials are accurately weighed, mixed and ground evenly. The homogeneously mixed raw materials were kept at 1200°C for 0.5h, then poured into a stainless steel mold preheated to 400°C for cooling and forming, and then kept at 400°C for 3h and then cooled with the furnace to obtain luminescent glass. Heat the luminescent glass from room temperature to 350°C and keep it warm for 10 hours, take it out and put it in a high-temperature furnace at 400°C for 10 hours, and then cool it with the furnace to obtain a luminescent glass-ceramic, whose crystal phase composition is Ca 2 P 2 o 7 and Ca 3 (PO 4 ) 2 . Under the excitation of 396nm ultraviolet light, its emission spectrum includes 486nm, 542nm, 583nm and 621nm emission peaks, corresponding to Tb 3+ of 5...
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