Waterproof, high temperature resistant, low-illuminance yellow-green luminous powder and production method
A production method and low-illumination technology, applied in chemical instruments and methods, luminescent materials, etc., can solve the problems of short storage time, easy oxidation, long afterglow, etc., and achieve the effect of reducing light absorption energy level, not easy to oxidize, and improving brightness
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Embodiment 1
[0025] Take 5kg of wet-mixed solid mixture (wherein spherical γ-Al 2 o 3 19.363mol; high-purity SrCO 3 18.924mol; Eu 2 o 3 0.1402mol; Dy 2 o 3 0.1609mol; H 3 BO 3 1.996mol) into a crucible, and reacted at 1400°C for 3 hours in a reducing atmosphere. The block material was crushed, ground, and sieved to obtain a certain particle size of luminous powder that emits yellow-green light in the dark;
[0026] In 1000ml solution (containing 0.815N NaH 2 PO 4 , 0.777N HCl and H 2 SO 4 mixture) was added to powder 1250g and stirred for 40 minutes;
[0027] Precipitate, pour off the clear liquid, add 1000ml of 25°C water, add 0.01N Na 2 HPO 4 25ml and stir for 3 minutes;
[0028] Precipitate, pour off the clear liquid, add 1000ml of 25°C water, slowly add 0.98N Na 2 SiO 3 Solution 150ml,
[0029] Make pH = 6.5, then add 50ml of 0.25N NaOH solution to make pH = 6.8; then add 0.1N NaOH solution 2 CO 3 Solution 30ml, make pH=7.0;
[0030] After precipitation, pour off th...
Embodiment 2
[0034] Take 5kg of wet-mixed solid mixture (wherein spherical γ-Al 2 o 3 19.363mol; high-purity SrCO 3 18.924mol; Eu 2 o 3 0.1402mol; Dy 2 o 3 0.1609mol; H 3 BO 3 1.996mol) into a crucible, and reacted at 1400°C for 3 hours in a reducing atmosphere. The block material was crushed, ground, and sieved to obtain a certain particle size of luminous powder that emits yellow-green light in the dark;
[0035] In 1000ml solution containing (0.815N NH 4 h 2 PO 4 , 0.777N HCl) was added to 1250g of powder, and stirred for 40 minutes;
[0036] Precipitate, pour off the clear liquid, add 1000ml of 25°C water, add 0.01N Na 2 HPO 4 25ml and stir for 3 minutes;
[0037] Precipitate, pour off the clear liquid, add 1000ml of 25°C water, slowly add 0.98N Na 2 SiO 3 Solution 150ml,
[0038] Make pH = 6.5, then add 50ml of 0.25N NaOH solution to make pH = 6.8; then add 0.1N NaOH solution 2 CO 3 Solution 30ml, make pH=7.0;
[0039]After precipitation, pour off the clear liquid, ...
Embodiment 3
[0043] Take 5kg of wet-mixed solid mixture (wherein spherical γ-Al 2 o 3 19.363mol; high-purity SrCO 3 18.924mol; Eu 2 o 3 0.1402mol; Dy 2 o 3 0.1609mol; H 3 BO 3 1.996mol) into a crucible, and reacted at 1400°C for 3 hours in a reducing atmosphere. The block material was crushed, ground, and sieved to obtain a certain particle size of luminous powder that emits yellow-green light in the dark;
[0044] In 1000ml solution (containing 0.815N NaH 2 PO 4 , 0.777N of HNO 3 and H 2 SO 4 Two kinds of mixtures) add powder 1250g, stir for 40 minutes;
[0045] Precipitate, pour off the clear liquid, add 1000ml of 25°C water, add 0.01N concentration (NH 4 ) 2 HPO 4 25ml and stir for 3 minutes;
[0046] Precipitate, pour off the clear liquid, add 1000ml of 25°C water, slowly add 0.98N Na 2 SiO 3 Liquid 150ml,
[0047] Make pH = 6.5, then add 50ml of 0.25N concentration KOH solution, make pH=6.8; then add 0.1N concentration KOH solution 2 CO 3 Solution 30ml, make pH=7....
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