Origins of photoluminescence bands induced by ultraviolet photons in polyethylene

Author

Ito, T. ; Kaneko, D. ; Ohki, Y.

Author_Institution

Dept. of Electr., Electron., & Comput. Eng., Waseda Univ., Tokyo, Japan

fYear

2002

fDate

2002

Firstpage

856

Lastpage

860

Abstract

Photoluminescence (PL) spectra in low-density polyethylene (LDPE) and crosslinked polyethylene (XLPE) induced by irradiation of ultraviolet photons are examined. The samples were pre-irradiated by the ultraviolet photons under different atmospheres (air, O₂, and vacuum) in order to induce photochemical reactions. Two PL bands appear around 3.6 and 4.2 eV in LDPE. Their intensities decrease with the progress of the pre-irradiation regardless of the irradiation atmosphere. The two PLs are considered to be due to conjugated double bonds present in the antioxidant and impurities. A new PL band appears at 2.9 eV in LDPE if the sample was pre-irradiated in vacuum. This PL is considered to be due to photoinduced conjugated double bonds. In XLPE, a PL band different from the ones observed in LDPE appears at 3.1 eV. It is considered that the crosslinking byproducts are responsible for this band.

Keywords

photoluminescence; polyethylene insulation; ultraviolet radiation effects; 2.9 eV; 3.1 eV; 3.6 eV; 4.2 eV; crosslinked polyethylene; low-density polyethylene; photochemical reactions; photoluminescence bands; polyethylene; ultraviolet photons; Laser excitation; Luminescence; Optical pulses; Photochemistry; Photoluminescence; Polyethylene; Polymers; Power lasers; Pulse measurements; Space vector pulse width modulation;

fLanguage

English

Publisher

ieee

Conference_Titel

Electrical Insulation and Dielectric Phenomena, 2002 Annual Report Conference on

Print_ISBN

0-7803-7502-5

Type

conf

DOI

10.1109/CEIDP.2002.1048930

Filename

1048930