Spontaneous and stimulated emission from a ladder-type conjugated polymer

被引:33
作者
Schweitzer, B [1 ]
Wegmann, G
Hertel, D
Mahrt, RF
Bässler, H
Uckert, F
Scherf, U
Müllen, K
机构
[1] Univ Marburg, Inst Phys Chem, D-35032 Marburg, Germany
[2] Univ Marburg, Wissensch Zentrum Mat Wissensch, D-35032 Marburg, Germany
[3] Univ Marburg, Fachbereich Phys, Inst Phys Chem, D-35032 Marburg, Germany
[4] Max Planck Inst Polymerforsch, D-55128 Mainz, Germany
来源
PHYSICAL REVIEW B | 1999年 / 59卷 / 06期
关键词
D O I
10.1103/PhysRevB.59.4112
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
Fluorescence from films as well as from a solid solution of a ladder-type poly(para-phenylene) has been studied as a function of pump energy upon excitation at variable spectral positions within the inhomogeneously broadened absorption band. Photoinduced transmission changes following excitation with 200 fs laser pulses at 25000 cm(-1) have been recorded at variable delay time, The latter testify on the occurrence of optical gain in the spectral range of spontaneous emission and of absorption bleaching. The initial decay time of the gain is on the order of 1 ps. Above a certain pump power a 180 cm(-1) broad emission feature emerges from the inhomogeneously broadened fluorescence spectrum of the film. Upon exciting within the low energy tail of the S-1 <-- S-0 0-0 absorption band sharp (7-9 cm(-1)) emission features show up, off-set from the laser line by the energies of the dominant vibrational modes of the polymer. The phenomenon is identified as amplified spontaneous emission induced by spontaneous emission from polymer segments prior to the depopulation by energy transfer towards lower energy sites. [S0163-1829(99)12805-4].
引用
收藏
页码:4112 / 4118
页数:7
相关论文
共 31 条
[1]  
BASSLER H, 1997, PRIMARY PHOTOEXCITAT
[2]  
BATCHELDER DN, 1989, OPTICAL TECHNIQUES C, P393
[3]   Blue superradiance from neat semiconducting alternating copolymer films [J].
Brouwer, HJ ;
Krasnikov, VV ;
Hilberer, A ;
Hadziioannou, G .
ADVANCED MATERIALS, 1996, 8 (11) :935-&
[4]   Excited-state dynamics of poly(para-phenylene)-type ladder polymers at high photoexcitation density [J].
Cerullo, G ;
Stagira, S ;
Nisoli, M ;
De Silvestri, S ;
Lanzani, G ;
Kranzelbinder, G ;
Graupner, W ;
Leising, G .
PHYSICAL REVIEW B, 1998, 57 (20) :12806-12811
[5]   INTERPRETATION OF THE VIBRATIONAL-SPECTRA OF PLANARIZED POLY-P-PHENYLENE [J].
CUFF, L ;
KERTESZ, M ;
SCHERF, U ;
MULLEN, K .
SYNTHETIC METALS, 1995, 69 (1-3) :683-684
[6]   Factors influencing stimulated emission from poly(p-phenylenevinylene) [J].
Denton, GJ ;
Tessler, N ;
Harrison, NT ;
Friend, RH .
PHYSICAL REVIEW LETTERS, 1997, 78 (04) :733-736
[7]  
Denton GJ, 1997, ADV MATER, V9, P547, DOI 10.1002/adma.19970090705
[8]   Mirrorless lasing in conducting polymer poly(2,5-dioctyloxy-p-phenylenevinylene) films [J].
Frolov, SV ;
Ozaki, M ;
Gellermann, W ;
Vardeny, ZV ;
Yoshino, K .
JAPANESE JOURNAL OF APPLIED PHYSICS PART 2-LETTERS & EXPRESS LETTERS, 1996, 35 (10B) :L1371-L1373
[9]   Cooperative emission in pi-conjugated polymer thin films [J].
Frolov, SV ;
Gellermann, W ;
Ozaki, M ;
Yoshino, K ;
Vardeny, ZV .
PHYSICAL REVIEW LETTERS, 1997, 78 (04) :729-732
[10]   Narrow-band emissions from conjugated-polymer films [J].
Gelinck, GH ;
Warman, JM ;
Remmers, M ;
Neher, D .
CHEMICAL PHYSICS LETTERS, 1997, 265 (3-5) :320-326