Photoluminescent properties of BaF2 scintillator-polystyrene composite films under vacuum ultraviolet radiation

被引：4

作者：

Coura, Rayssa L. C. ^{[1
,2
]}

Andrade, Adriano B. ^{[1
,2
]}

Monteiro, Thaise J. ^{[2
]}

Novais, Suellen M., V ^{[3
]}

Macedo, Zelia S. ^{[1
,2
]}

Valerio, Mario E. G. ^{[1
,2
]}

机构：

[1] Univ Fed Sergipe, Mat Sci & Engn Dept, BR-49100000 Sao Cristovao, SE, Brazil

[2] Univ Fed Sergipe, Phys Dept, Lab Preparat & Characterizat Mat LPCM, BR-49100000 Sao Cristovao, SE, Brazil

[3] Univ Fed Reconcavo Bahia, Phys Dept, Grp Photon Mat, BR-45300000 Amargosa, BA, Brazil

来源：

MATERIALS RESEARCH BULLETIN | 2021年 / 135卷

关键词：

Composite films; BaF2; Luminescence; Energy transfer; HYDROTHERMAL SYNTHESIS; LANTHANIDE COMPLEXES; OPTICAL-PROPERTIES; LUMINESCENT; EMISSION; DYE;

D O I：

10.1016/j.materresbull.2020.111159

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

This work reports a new synergistic effect observed in self-sustainable composite films, composed by barium fluoride (BaF2) nanoparticles embedded in polystyrene matrix. Optical absorption measurements were performed in the ultraviolet and visible range. The luminescent properties were investigated by photoluminescence (PL) under excitation in the vacuum ultraviolet region. The PL results showed that self-trapped excitons of BaF2 nanoparticles incorporated into the polymeric matrix are excited at 5.6 eV. This value is 3.4 eV lower than the typical exciton formation energy observed for BaF2 isolated nanoparticles. This phenomenon can be understood as result of a synergistic effect, between polystyrene and BaF2, involving antenna effect and Foster energy transfer. PL lifetime measurements showed that the decay is composed by two main process with short lifetime. From chromatic coordinates of the emitted light it was possible to observe that light emission can be tuned to different shades of colors between blue and green.

引用

页数：11

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