Preparation of nano-cluster core-shell fluorescent powder used for high-power white-light LED
A technology of nano-clusters and phosphors, which is applied in the direction of luminescent materials, chemical instruments and methods, etc., can solve the problems of environmental pollution, low luminous efficiency, and high energy consumption of sulfide systems, so as to avoid reabsorption, improve luminous efficiency, The effect of low preparation temperature
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example 1
[0024] First, SiO 2 , BaF 2 , NiF 2 , MnO 2 , BiF 2 After weighing, grinding and mixing uniformly, mixed with methanesulfonic acid, placed in a microwave reactor, adjusted power to 1000W, reaction temperature 230°C, reacted for 6h to obtain composite micron particles;
[0025] Secondly, 2,4-diynylpyridine and silver nitrate are weighed in a 1:1 ratio and then mixed into propylene glycol. After heating and dissolving, DMEDA catalyst is added to generate silver nanoclusters wrapped by pyridine ring; the Bi / The Mn ion-doped composite micron particles and silver nanoclusters were mixed in a ratio of 5:2 and then dissolved in hydrogen peroxide, and hydrothermally reacted at 120°C to obtain a silver-modified core-shell composite co-emulsion.
[0026] Finally, the obtained co-emulsion is sintered at a high temperature and sintered at 400° C. for 3 hours to obtain a nano-cluster core-shell composite phosphor. figure 1 a is a TEM image, 2a is an ultraviolet absorption spectrum, and 3a is a ...
example 2
[0028] First, TiO 2 , Al 2 O 3 ,BaF 2 , CaF 2 , MnO, Bi 2 O 3 After weighing, grinding and mixing uniformly, mixed with methanesulfonic acid, placed in a microwave reactor, adjusted power to 1000W, reaction temperature 270°C, reacted for 8h to obtain composite micron particles;
[0029] Secondly, 2,4-diynylpyridine and silver nitrate are weighed in a ratio of 3:2 and then mixed into ethylene glycol monomethyl ether. After heating and dissolving, BiNAP catalyst is added to generate silver nanoclusters wrapped by pyridine ring; The obtained Bi / Mn ion-doped composite microparticles and silver nanoclusters were mixed in a ratio of 4:1 and dissolved in hydrogen peroxide, and the silver-modified core-shell composite co-emulsion was obtained by hydrothermal reaction at 120°C.
[0030] Finally, the obtained co-emulsion was sintered at a high temperature and sintered at 470° C. for 4 hours to obtain a nano-cluster core-shell composite phosphor. figure 1 b is a TEM image, 2b is an ultraviolet...
example 3
[0032] First of all, SiF 4 , Al 2 O 3 , CsF 2 , LiF 2 , MnO 2 , Bi(NO 3 ) 2 After weighing, grinding and mixing uniformly, mixed with methanesulfonic acid, placed in a microwave reactor, adjusted power to 1000W, reaction temperature 300°C, reacted for 2h to obtain composite micron particles;
[0033] Secondly, 2,4-diynylpyridine and silver oxalate were weighed 4:1 and mixed into 1,4-dioxane. After heating to dissolve, DIEA catalyst was added to generate silver nanoclusters wrapped by pyridine ring; The one-step Bi / Mn ion-doped composite micro-particles and silver nanoclusters are mixed in a ratio of 1:1 and then dissolved in hydrogen peroxide, and hydrothermally reacted at 180°C to obtain a silver-modified core-shell composite co-emulsion.
[0034] Finally, the obtained co-emulsion is sintered at a high temperature and sintered at 300° C. for 5 hours to obtain a nano-cluster core-shell composite phosphor. figure 1 c is the TEM image, 2c is the ultraviolet absorption spectrum, and 3c...
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