Evidence for the formation of unoccupied states in poly(2,3-diphenylphenylene vinylene) following the deposition of metal

被引：29
作者：
Ettedgui, E
Razafitrimo, H
Gao, Y
Hsieh, BR
Feld, WA
Ruckman, MW
机构：
[1] UNIV ROCHESTER,DEPT PHYS & ASTRON,ROCHESTER,NY 14627
[2] XEROX CORP,WEBSTER CTR RES & TECHNOL,WEBSTER,NY 14580
[3] WRIGHT STATE UNIV,DEPT CHEM,DAYTON,OH 45435
[4] BROOKHAVEN NATL LAB,DEPT PHYS,UPTON,NY 11973
来源：
PHYSICAL REVIEW LETTERS | 1996年 / 76卷 / 02期
关键词：
D O I：
10.1103/PhysRevLett.76.299
中图分类号：
O4 [物理学];
学科分类号：
0702 ;
摘要：
Near-edge x-ray-absorption spectroscopy was used to study the interaction of Ca and Al with poly(2,3-diphenylphenylene vinylene) (DP-PPV). Al does not significantly modify the C-K edge during interface formation while Ca does in a coverage dependent fashion. The evolution of the C-K edge points to the creation of new intragap states. In addition, we see a strong resonance at higher photon energies. The creation of new unoccupied states in DP-PPV following the deposition of Ca may in part explain the enhanced charge injection observed when Ca is used as the cathode material in polymer-based light emitting diodes.
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页码：299 / 302
页数：4
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