Picosecond spectroscopy and hyperlinear photoluminescence in poly(para-phenylene)-type ladder polymers

被引:30
作者
Kranzelbinder, G
Byrne, HJ
Hallstein, S
Roth, S
Leising, G
Scherf, U
机构
[1] GRAZ TECH UNIV,INST FESTKORPERPHYS,A-8010 GRAZ,AUSTRIA
[2] DUBLIN INST TECHNOL,DEPT PHYS,DUBLIN 8,IRELAND
[3] MAX PLANCK INST FESTKORPERFORSCH,D-70506 STUTTGART,GERMANY
[4] MAX PLANCK INST POLYMER RES,D-55128 MAINZ,GERMANY
来源
PHYSICAL REVIEW B | 1997年 / 56卷 / 03期
关键词
D O I
10.1103/PhysRevB.56.1632
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
In our investigations of the photoluminescence in poly-(para-phenylene)-type ladder-polymer films a highly nonlinear dependence of the emission spectra is observable at elevated excitation densities. A spectral redistribution results in the hyperlinear increase of emission efficiency in the blue region, as the vibronic 0-1 transition (lambda=492 nm) becomes the most predominant radiative relaxation. The detailed study of temporal decay and spectral evolution of luminescence provided by streak camera measurements performed in the temperature range T=20-300 K reveals the spectrum being composed by the contributions of two different emitting species, namely, S-1-singlet states and aggregates. The material is found to be photochemically stable and luminescence does not seem to be limited by saturation effects even under high-excitation conditions, which is essential for laser application.
引用
收藏
页码:1632 / 1636
页数:5
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