A method for preparation of
yttrium aluminium garnet relates to a preparation technology for fluorescent
powder, especially to a preparation technology for
yttrium aluminium garnet activated by
europium, which provides a method for preparation of
yttrium aluminium garnet which adopts macromolecular network gelatinization, does not need to mill, without birdnesting or small birdnesting, can be directly used in packing and can exert its optical performance with a high limit, and is no environmental
contamination and can save the cost. The method consists of adding
aluminum nitrate,
citric acid, yttrium
nitrate and
europium nitrate into a container, adding deionized water, adjusting pH value to neutral with ammonial solution,with a thermostatic bath, adding
acrylamide and N,N-
methylene biacrylamide, having a thermostatic bath until
acrylamide and N,N-
methylene biacrylamide dissolve, adding tetraethylethylene
diamine and
hydrogen dioxide solution to initiate the
polymerization, obtaining the YAG macromolecular network gel by a thermostatic bath, then removing the
moisture and the
organic matter by heat treatment, by heat
decomposition, decomposing concentrated
nitric acid to corresponding oxidate,obtaining the powders by pre-
calcination, then by high-temperature heat treatment, performing degree of
crystallization to obtain YAG powders.