Combustion Synthesis Of Rare Earth Ions Doped Fluorescence Materials

Rare earth element possess abundant and particular electronic energy band structure,which lead to plentiful electron transition, so these element obtain multiform luminescencecharacter, this series of materials hold important place in luminescence materials zone.The traditional method to synthesize luminescence materials is solid-state reaction, thismethod could synthesize pure product with high purity, however, the long reaction time andhigh temperature restrict it's farther develop. In the experiment, CaAl2O4:Eu2+,Nd3+phosphor,Y2O2S:Eu3+ red fluorescence material and YAG:Ce3+ yellow fluorescence materialwere fabricated by urea(CH4N2S)-nitrate solution combustion synthesis at 400～600℃ withseveral minutes reaction time.From altering the reaction condition and the ratio of raw materials, the experimentanalyzed the purity and afterglow decay trend of CaAl2O4:Eu2+,Nd3+ phosphor influenced bythe quantity of urea. From the results, it was concluded that the quantity of urea equal to 5times of academic dosage, we could obtain the satisfactory material.Y2O2S:Eu3+ was a new type red fluorescence material, compared to traditional materials,it had excellent environment applicability. The experiment used CH4N2S as fuel tosynthesized Y2O2S:Eu3+ material at 450℃, from experimental results, it found that thequantity of CH4N2S equal to 4～4.5 times of academic dosage, the quantity of byproduct(suchas S and Y2O3:Eu3+) at low level, the product with preferable luminescence character.YAG:Ce3+ yellow fluorescence material was important part of white light LED, it withexcitation spectrum peak at 470nm, the experiment synthesized YAG:Ce3+ material bycombustion synthesis. Because the white light composed by InGaN blue LED chip andYAG:Ce3+ yellow material lack of long wave component, the experiment studied theexcitation spectrum peak of YAG:Ce3+ material shift towards long wave when changing thestructure of YAG.. For same purpose, the Ca1-xSrxS:Eu2+ red fluorescence material wasproduced by combustion synthesis, it had strong excitation at 470nm, so it could be used towhite light LED with YAG:Ce3+ material together. Used the above two methods, theirradiance character of white light LED could be improved effectively.