STM-induced luminescence study of poly(p-phenylenevinylene) by conversion under ultraclean conditions

被引：48

作者：

Alvarado, SF ^{[1
]}

Riess, W ^{[1
]}

Seidler, PF ^{[1
]}

Strohriegl, P ^{[1
]}

机构：

[1] UNIV BAYREUTH,BAYREUTHER INST MAKROMOL FORSCH,D-95440 BAYREUTH,GERMANY

来源：

PHYSICAL REVIEW B | 1997年 / 56卷 / 03期

关键词：

D O I：

10.1103/PhysRevB.56.1269

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Curing-temperature-dependent spectroscopic studies of the conversion process of the sulfonium chloride prepolymer to the conjugated polymer poly(p-phenylenevinylene) reveal an enhancement of the luminescence efficiency when the films are converted under ultrahigh-vacuum conditions. In these experiments, luminescence is excited by electron injection from the tip of a scanning tunneling microscope and the maximum luminescence efficiency is found between 225 degrees and 260 degrees C. The optimum conversion temperature, the total luminescence yield, and the spectral features of the luminescence depend on the substrate material, heating gradient, and composition and purity of the prepolymer. The curing-temperature dependence of the Franck-Condon intensity distribution has a complex behavior. Maximum luminescence efficiency is characterized by a spectrum where the upsilon = 0,1 vibronic transition has maximum relative intensity. Images of scanning-tunneling-microscopy-excited luminescence show intensity fluctuations within surface domains as small as a few nanometers in diameter, regions that correlate with the topographic features of the poly(p-phenylenevinylene) surface.

引用

页码：1269 / 1278

页数：10

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