Gd2O3:Eu3+/PPO/POPOP/PS composites for digital imaging radiation detectors

• Tipo: Artigo em Revista Científica Internacional
• Data: 2015

Autores

Oliveira, J (Autor) Outra; Martins, PM (Autor) Outra; Martins, P (Autor) Outra; Correia, V (Autor) Outra; Rocha, JG (Autor) Outra; Lanceros Mendez, S (Autor) Outra

Revista

Título: Applied Physics A: Materials Science and Processing

Vol. 121

Páginas: 581-587

ISSN: 0947-8396

Editora: Springer Nature

Indexação

ISI Web of Knowledge - 7 Citações

Scopus - 11 Citações

Outras Informações

ID Authenticus: P-00G-JM7

DOI: 10.1007/s00339-015-9435-2

Abstract (EN): Polymer-based scintillator composites have been produced by combining polystyrene (PS) and Gd2O3:Eu3+ scintillator nanoparticles. Polystyrene has been used since it is a flexible and stable binder matrix, resistant to thermal and light deterioration and with suitable optical properties. Gd2O3:Eu3+ has been selected as scintillator material due to its wide band gap, high density and visible light yield. The optical, thermal and electrical characteristics of the composites were studied as a function of filler content, together with their performance as scintillator material. Additionally 1 wt.% of 2,5-diphenyloxazole (PPO) and 0.01 wt.% of 1,4 di[2-(5phenyloxazolyl)]benzene (POPOP) were introduced in the polymer matrix in order to strongly improve light yield, i.e., the measured intensity of the output visible radiation, under X-ray irradiation. Increasing scintillator filler concentration (from 0.25 to 7.5 wt.%) increases scintillator light yield and decreases the optical transparency of the composite. The addition of PPO and POPOP strongly increased the overall transduction performance of the composite due to specific absorption and re-emission processes. It is thus shown that Gd2O3:Eu3+/PPO/POPOP/PS composites with 0.25 wt.% of scintillator content with fluorescence molecules are suitable for the development of innovative large-area X-ray radiation detectors with huge demand from the industries.

Idioma: Inglês

Tipo (Avaliação Docente): Científica

Nº de páginas: 7