Preparation method of single-substrate fluorescent powder for white-light LEDs (light-emitting diodes)
A phosphor, a single technology, applied in the field of preparation of single-matrix phosphors for white LEDs, can solve problems such as difficult to achieve white light emission, and achieve the effect of high crystal phase purity and uniform particle size
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Embodiment 1
[0022] A kind of alkaline earth chlorosilicate-based white light phosphor powder for white light LED, its chemical composition formula is Ca 2 SiO 3 Cl 2 :xTb 3+ , where the value of x is 0.001.
[0023] 1) Calculate and synthesize 0.02mol of Ca according to the stoichiometric ratio 2 SiO 3 Cl 2 :xTb 3+ The quality of the drug required: weigh 0.02mol anhydrous CaCl 2 , 0.02mol Ca(NO3 ) 2 4H 2 O and weigh Tb according to the molar weight of Tb as 0.00002mol 4 o 7 , Measure 5ml of absolute ethanol and 4.48ml of ethyl silicate (TEOS) respectively. Will Tb 4 o 7 Dissolve in an appropriate amount of concentrated nitric acid solution with a weight concentration of 50-58%, heat to 75°C until Tb 4 o 7 The powder is completely dissolved, the amount of nitric acid is to dissolve Tb 4 o 7 It is advisable to use powder, and then use dilute NH with a concentration of 0.1mol / L 3 ·H 2 O Adjust the pH value of the solution to pH=4 until white insoluble matter appears, and f...
Embodiment 2
[0027] A kind of alkaline earth chlorosilicate-based white light phosphor powder for white light LED, its chemical composition formula is Ca 2 SiO 3 Cl 2 :xTb 3+ , where the value of x is 0.002.
[0028] 1) Calculate and synthesize 0.02mol of Ca according to the stoichiometric ratio 2 SiO 3 Cl 2 :xTb 3+ The quality of the drug required: weigh 0.02mol anhydrous CaCl 2 , 0.02mol Ca(NO 3 ) 2 4H 2 O and weigh Tb according to the molar weight of Tb as 0.00004mol 4 o 7 , Measure 6ml of absolute ethanol and 4.48ml of ethyl silicate (TEOS) respectively. Will Tb 4 o 7 Dissolve in an appropriate amount of concentrated nitric acid solution with a weight concentration of 50-58%, heat to 85°C until Tb 4 o 7 The powder is completely dissolved, the amount of nitric acid is to dissolve Tb 4 o 7 It is advisable to use powder, and then use dilute NH with a concentration of 0.1mol / L 3 ·H 2 O Adjust the pH value of the solution to pH=5 until white insoluble matter appears, and...
Embodiment 3
[0032] A kind of alkaline earth chlorosilicate-based white light phosphor powder for white light LED, its chemical composition formula is Ca 2 SiO 3 Cl 2 :xTb 3+ , where the value of x is 0.003.
[0033] 1) Calculate and synthesize 0.02mol of Ca according to the stoichiometric ratio 2 SiO 3 Cl 2 :xTb 3+ The quality of the drug required: weigh 0.02mol anhydrous CaCl 2 , 0.02mol Ca(NO 3 ) 2 4H 2 O and weigh Tb according to the molar weight of Tb as 0.00006mol 4 o 7 , Measure 6ml of absolute ethanol and 4.48ml of ethyl silicate (TEOS) respectively. Will Tb 4 o 7 Dissolve in an appropriate amount of concentrated nitric acid solution with a weight concentration of 50-58%, and heat to 90°C until Tb 4 o 7 The powder is completely dissolved, the amount of nitric acid is to dissolve Tb 4 o 7 It is advisable to use powder, and then use dilute NH with a concentration of 0.1mol / L 3 ·H 2 O Adjust the pH value of the solution to pH=5 until white insoluble matter appears,...
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