Phosphor for GaN based light-emitting diode and method for preparing same
A technology of light-emitting diodes and phosphors, which is applied in the field of white light LEDs, can solve the problems of undiscovered, matching excitation wavelengths of phosphors, and can not well satisfy UV-LEDs, etc., and achieves the effect of broadening the emission spectrum.
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[0026] Example 1: Ca(La 0.8 Ce 0.2 )Ga 3 S 6 Synthesis of O phosphor:
[0027] CaCO 3 (Analytical grade) 0.1122 grams;
[0028] La 2 S 3 0.2992 grams;
[0029] Ga2 S 3 0.7069 grams;
[0030] Ce 2 S 3 0.0753 grams;
[0031] Will La 2 O 3 (99.99%), CeO 2 (99.99%) at 1200℃, reducing gas CS 2 Burn for 3 to 4 hours to obtain La 2 S 3 , Ce 2 S 3 Raw material; Ga 2 O 3 (Analytical grade) at 900℃, reducing gas CS 2 Burn for 2 to 3 hours to obtain Ga 2 S 3 raw material. Weigh the obtained raw materials according to the above composition, grind and mix them in an agate mortar, put them into a corundum crucible, pour nitrogen into the quartz tube before heating, and sinter at 920°C for 3.5 hours in a nitrogen atmosphere. Cool down After grinding evenly, crushing and sieving, the final product is obtained. The X-ray diffraction pattern of the phosphor is shown in Figure 1, which is consistent with the standard card #39-0560, indicating that Ca(La 0.8 Ce 0.2 )Ga 3 S 6 The pure phase o...
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[0032] Example 2: Ba(Y 0.95 Ce 0.05 )Ga 3 S 6 Synthesis of O phosphor:
[0033] BaCO 3 (Analytical grade) 0.3946 grams;
[0034] Y 2 S 3 0.2603 grams;
[0035] Ga 2 S 3 0.7069 grams;
[0036] Ce 2 S 3 0.0188 grams;
[0037] Will Y 2 O 3 (99.99%), CeO 2 (99.99%) at 1200℃, reducing gas CS 2 Burn for 3 to 4 hours to get Y 2 S 3 , Ce 2 S 3 Raw material; Ga 2 O 3 (Analytical grade) at 900℃, reducing gas CS 2 Burn for 2 to 3 hours to obtain Ga 2 S 3 raw material. Weigh the obtained raw materials according to the above composition, grind and mix them in an agate mortar, put them into a corundum crucible, pour nitrogen into the quartz tube before heating, and sinter at 950°C for 2 hours in a nitrogen atmosphere, and cool down After grinding evenly, crushing and sieving, the final product is obtained. The sample is excited under 395nm ultraviolet light and emits blue light. Excitation and emission spectra at room temperature are shown in Figure 3.
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[0038] Example 3: Sr(La 0.94 Ce 0.03 Eu 0.03 )Ga 3 S 6 Synthesis of O phosphor:
[0039] SrO (analytical purity) 0.2072 g;
[0040] La 2 S 3 0.3516 grams;
[0041] Ga 2 S 3 0.7069 grams;
[0042] Ce 2 S 3 0.0113 g;
[0043] EuS 0.0110 g;
[0044] Will La 2 O 3 (99.99%), CeO 2 (99.99%), Eu 2 O 3 (99.99%) at 1200℃, reducing gas CS 2 Burn for 3 to 4 hours to obtain La 2 S 3 , Ce 2 S 3 , EuS raw material; Ga 2 O 3 (Analytical grade) at 900℃, reducing gas CS 2 Burn for 2 to 3 hours to obtain Ga 2 S 3 raw material. Weigh the obtained raw materials according to the above composition, grind and mix them in an agate mortar, and put them into a corundum crucible. Before heating, pour argon gas to purify the air in the quartz tube, and sinter it at 850°C for 3 hours in an argon atmosphere , After cooling, grind uniformly, crush and sieve, and finally get the product. The sample is excited under 400nm ultraviolet light and mainly emits blue light. Excited under 460nm blue light, only...
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