Relaxation of second-harmonic generation in guest/host polymers poled by indium-tin oxide sandwich electrodes

Stephan Schussler, Ranko Richert, Heinz Bassler

Research output: Contribution to journalArticle

31 Citations (Scopus)

Abstract

Second-harmonic generation (SHG) is used to monitor reorientation dynamics of 4-(dimethylamino)-4′-nitrostilbene doped at 1 wt % in poly(ethyl methacrylate) within a temperature range of TG ± 30 K. Special emphasis is put on a systematic analysis of experimental conditions and their severe impact on SHG data for samples which are poled in an indium-tin oxide (ITO)-sandwich-electrode configuration. These effects include thermal history, local heating effects due to laser focus, importance of dopant concentration, physical aging, details of the poling procedure, and charge-injection effects. The fast initial response of the SHG signal upon field switching is attributed to space charge effects. We show how the problem of SHG reproducibility can be overcome with appropriate experimental conditions. Analysis of the reliable data is based on a Gaussian distribution of energy barriers for the dopant relaxation which yields superior fits compared to a stretched exponential function. The arrhenius-like behavior of the mean SHG decay rate points toward a decoupling of the dopant motion from the bulk α-process of the polymer host. Additionally, a novel repoling technique and its implications are discussed.

Original languageEnglish (US)
Pages (from-to)4318-4326
Number of pages9
JournalMacromolecules
Volume27
Issue number15
StatePublished - Jan 1 1994
Externally publishedYes

Fingerprint

Harmonic generation
Tin oxides
Indium
Polymers
Electrodes
Doping (additives)
Charge injection
Exponential functions
Energy barriers
Gaussian distribution
Electric space charge
Thermal effects
Aging of materials
indium tin oxide
Heating
Lasers
Temperature

ASJC Scopus subject areas

  • Materials Chemistry

Cite this

Relaxation of second-harmonic generation in guest/host polymers poled by indium-tin oxide sandwich electrodes. / Schussler, Stephan; Richert, Ranko; Bassler, Heinz.

In: Macromolecules, Vol. 27, No. 15, 01.01.1994, p. 4318-4326.

Research output: Contribution to journalArticle

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