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Preiskave luminiscentnih snovi s fluorescenčno spektrometrijo = Study of luminescent materials by fluorescence spectrometry
Županc Mežnar, Lea ; Irmančnik-Belič, Lidija
Luminiscentne snovi pri vzbujanju z UV-svetlobo (v fluorescentnih svetilih ali z visokoenergijskimi elektroni (v katodnih elektronkah) emitirajo vidno svetlobo. Z uvajanjem novih oblik prikazalnikov ...se je pojavila potreba po luminiscentnih snoveh, ki bodo imele uporaben svetlobni izkoristek že pri nižjih vzbujevalnih napetostih. S sol-gel postopkom smo pripravili več luminiscentnih snovi: ▫$SnO_2:Tb, SiO_2:Tb, Y_2O_3:Eu in Y_2SiO_5:Eu$▫. Kot prekurzorje smo uporabili kloridne in nitratne soli vhodnih elementov ter tetraetilortosilikat. S fluorescenčno spektroskopijo smo pomerili vzbujevalne in emisijske spektre pripravljenih prahov pred in po segrevanju. Označili smo posamezne prehode aktivatorja (terbija ali evropija) in ugotovili, da ima sama oksidna matrika zanemarljiv vpliv na emisijski spekter dopirane snovi. Določili smo tudi čas emitiranja snovi, potem ko prenehamo z vzbujanjem. Ker morajo imeti luminiscentni prahovi z dobrim izkoristkom urejeno kristalno rešetko, smo produktom po segrevanju določili strukturo z rentgensko difrakcijo.
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