Improvement of luminescence efficiency and photostability in polymer thin films

S. M. Lipson; D. F. O'Brien; H. J. Byrne; A. P. Davey; W. J. Blau

doi:10.1016/S0040-6090(00)00945-7

Improvement of luminescence efficiency and photostability in polymer thin films

S. M. Lipson, D. F. O'Brien, H. J. Byrne, A. P. Davey, W. J. Blau

Physical to Life Sciences Research Hub

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Abstract

The photodegradation mechanism and luminescence efficiency of a series of thin polymer films prepared under a variety of conditions was studied. The conjugated polymer, poly(m-phenylene-co-2,5-dioctoxy-p-phenylenevinylene) (PmPV), is shown by infra-red spectroscopy to degrade via the chain scission of the carbon double bond along the polymer backbone. This causes a reduction in conjugation length and a blue shift in its absorption and photoluminescence (PL) spectra. To reduce photodegradation effects, films were prepared using argon (Ar) gas and were investigated in air and an oxygen free environment. The initial PL intensity increased by over 70% for Ar treated films. The PL decay in air was bi-exponential in nature, with a sharp initial decay linked to atmospheric oxygen, and a longer second decay linked to oxygen embedded in the film. The increase in both PL efficiency and degradation lifetime, coupled with device encapsulation, should significantly improve the performance of electroluminescent devices.

Original language	English
Pages (from-to)	262-267
Number of pages	6
Journal	Thin Solid Films
Volume	370
Issue number	1
DOIs	https://doi.org/10.1016/S0040-6090(00)00945-7
Publication status	Published - 17 Jul 2000

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@article{9ca0d5f6900143e789396050d8fd5eeb,

title = "Improvement of luminescence efficiency and photostability in polymer thin films",

abstract = "The photodegradation mechanism and luminescence efficiency of a series of thin polymer films prepared under a variety of conditions was studied. The conjugated polymer, poly(m-phenylene-co-2,5-dioctoxy-p-phenylenevinylene) (PmPV), is shown by infra-red spectroscopy to degrade via the chain scission of the carbon double bond along the polymer backbone. This causes a reduction in conjugation length and a blue shift in its absorption and photoluminescence (PL) spectra. To reduce photodegradation effects, films were prepared using argon (Ar) gas and were investigated in air and an oxygen free environment. The initial PL intensity increased by over 70\% for Ar treated films. The PL decay in air was bi-exponential in nature, with a sharp initial decay linked to atmospheric oxygen, and a longer second decay linked to oxygen embedded in the film. The increase in both PL efficiency and degradation lifetime, coupled with device encapsulation, should significantly improve the performance of electroluminescent devices.",

author = "Lipson, \{S. M.\} and O'Brien, \{D. F.\} and Byrne, \{H. J.\} and Davey, \{A. P.\} and Blau, \{W. J.\}",

note = "Funding Information: The authors gratefully acknowledge the financial support of the European Union ESPRIT project 28580, LUPO (a novel approach to solid state short wavelength laser generation using luminescent polymers). D. O'Brien and S. Lipson would like to acknowledge COST 518 for providing financial support for travel. S. Lipson would like to thank Dr David Lidzey, University of Sheffield, for help with the integrating sphere measurements. ",

year = "2000",

month = jul,

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doi = "10.1016/S0040-6090(00)00945-7",

language = "English",

volume = "370",

pages = "262--267",

journal = "Thin Solid Films",

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T1 - Improvement of luminescence efficiency and photostability in polymer thin films

AU - Lipson, S. M.

AU - O'Brien, D. F.

AU - Byrne, H. J.

AU - Davey, A. P.

AU - Blau, W. J.

N1 - Funding Information: The authors gratefully acknowledge the financial support of the European Union ESPRIT project 28580, LUPO (a novel approach to solid state short wavelength laser generation using luminescent polymers). D. O'Brien and S. Lipson would like to acknowledge COST 518 for providing financial support for travel. S. Lipson would like to thank Dr David Lidzey, University of Sheffield, for help with the integrating sphere measurements.

PY - 2000/7/17

Y1 - 2000/7/17

N2 - The photodegradation mechanism and luminescence efficiency of a series of thin polymer films prepared under a variety of conditions was studied. The conjugated polymer, poly(m-phenylene-co-2,5-dioctoxy-p-phenylenevinylene) (PmPV), is shown by infra-red spectroscopy to degrade via the chain scission of the carbon double bond along the polymer backbone. This causes a reduction in conjugation length and a blue shift in its absorption and photoluminescence (PL) spectra. To reduce photodegradation effects, films were prepared using argon (Ar) gas and were investigated in air and an oxygen free environment. The initial PL intensity increased by over 70% for Ar treated films. The PL decay in air was bi-exponential in nature, with a sharp initial decay linked to atmospheric oxygen, and a longer second decay linked to oxygen embedded in the film. The increase in both PL efficiency and degradation lifetime, coupled with device encapsulation, should significantly improve the performance of electroluminescent devices.

AB - The photodegradation mechanism and luminescence efficiency of a series of thin polymer films prepared under a variety of conditions was studied. The conjugated polymer, poly(m-phenylene-co-2,5-dioctoxy-p-phenylenevinylene) (PmPV), is shown by infra-red spectroscopy to degrade via the chain scission of the carbon double bond along the polymer backbone. This causes a reduction in conjugation length and a blue shift in its absorption and photoluminescence (PL) spectra. To reduce photodegradation effects, films were prepared using argon (Ar) gas and were investigated in air and an oxygen free environment. The initial PL intensity increased by over 70% for Ar treated films. The PL decay in air was bi-exponential in nature, with a sharp initial decay linked to atmospheric oxygen, and a longer second decay linked to oxygen embedded in the film. The increase in both PL efficiency and degradation lifetime, coupled with device encapsulation, should significantly improve the performance of electroluminescent devices.

UR - https://www.scopus.com/pages/publications/0033716398

U2 - 10.1016/S0040-6090(00)00945-7

DO - 10.1016/S0040-6090(00)00945-7

M3 - Article

AN - SCOPUS:0033716398

SN - 0040-6090

VL - 370

SP - 262

EP - 267

JO - Thin Solid Films

JF - Thin Solid Films

IS - 1

ER -

Improvement of luminescence efficiency and photostability in polymer thin films

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