STM-excited luminescence on organic materials

被引：32

作者：

Alvarado, SF ^{[1
]}

Libioulle, L ^{[1
]}

Seidler, PF ^{[1
]}

机构：

[1] IBM Corp, Zurich Res Lab, CH-8803 Ruschlikon, Switzerland

来源：

SYNTHETIC METALS | 1997年 / 91卷 / 1-3期

关键词：

luminescence; scanning tunnelling microscopy;

D O I：

10.1016/S0379-6779(98)80066-0

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

A scanning tunneling microscope (STM) is used to generate electroluminescence from thin films of tris(8-hydroxyquinolato) aluminum (Alq(3)) deposited on Au(111) substrates. The emission spectra are highly dependent on the local structural features of the thin film. Furthermore, the intensity distribution is modulated by the collective charge-carrier excitations of the tip and the substrate. This is manifested as a red-shifted emission spectrum characterized by relatively narrow emission lines from the organic material. The luminescence signal appears to be a linear superposition of two different kinds of Alq(3). We show also that the energy of the lowest unoccupied molecular orbital (LUMO) can be determined with the aid of measurements of the threshold for tunneling-excited electroluminescence. For Alq(3) we find E-LUMO = 1.57+/-0.15 eV above the Fermi level. (C) 1997 Published by Elsevier Science S.A.

引用

页码：69 / 72

页数：4

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