Luminescence Properties and Energy Transfer Processes in Nanosized Cerium Doped YAG

Author

Pankratov, Vladimir ; Grigorjeva, Larisa ; Chernov, Stanislav ; Chudoba, Tadeusz ; Lojkowski, Witold

Author_Institution

Inst. of Solid State Phys., Univ. of Latvia, Riga

Volume

55

Issue

3

fYear

2008

fDate

6/1/2008 12:00:00 AM

Firstpage

1509

Lastpage

1513

Abstract

Luminescence properties of cerium doped Y₃Al₅O₁₂ (YAG) nanocrystals in form of nanopowders and nanoceramics have been studied. The comparative analysis of luminescence characteristics for nano- and single-crystals has been done. It was detected that an excitonic mechanism of the energy transfer from the host lattice to cerium ions does not work in nanopowders and nanoceramics. It was also shown that antisite-related and self-trapped exciton-related luminescence bands are suppressed strongly in nanopowders, and it can be excited only under certain circumstances. These bands practically disappeared in the nanoceramic samples. It was suggested that nanoparticle´s surface, which is an efficient trap for excitons and charge carriers, plays the crucial role in peculiarities of luminescence characteristics in nanocrystals.

Keywords

antisite defects; ceramics; cerium; excitons; garnets; nanoparticles; photoluminescence; scintillation; yttrium compounds; Y₃Al₅O₁₂:Ce; antisite-related luminescence; energy transfer process; excitonic mechanism; nanoceramics; nanoparticles; nanopowders; nanosized cerium doped YAG; self-trapped exciton-related luminescence; yttrium-aluminum garnet; Ceramics; Cerium; Crystalline materials; Crystals; Energy exchange; Luminescence; Nanocrystals; Nanoparticles; Nanostructured materials; Raw materials; Nanoceramic; nanocrystals; scintillators; time-resolved luminescence; yttrium-aluminum garnet (YAG);

fLanguage

English

Journal_Title

Nuclear Science, IEEE Transactions on

Publisher

ieee

ISSN

0018-9499

Type

jour

DOI

10.1109/TNS.2007.915070

Filename

4545193