Efficient energy transfer in organic thin films by ultra-high vacuum evaporation

被引:2
作者
Porzio, W [1 ]
Giovanella, U [1 ]
Botta, C [1 ]
Pasini, M [1 ]
Destri, S [1 ]
Provasi, C [1 ]
Rossi, V [1 ]
机构
[1] CNR, ISMAC, Ist Studio Macromol, I-20133 Milan, Italy
关键词
film growth; oligomer co-evaporation; energy transfer; photoluminescence;
D O I
10.1016/j.orgel.2004.02.001
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
The energy transfer in organics, aiming to optimise the performance of many. LED devices, has been exploited with two suitable oligomers deposited either in multi layered or in co-evaporated films by ultra high vacuum evaporation. We have chosen two components displaying the appropriate absorption/emission windows, in fact the emission maximum of the first, a thienyl-fluorene derivative, is centred in the region where the absorption of the second, tetrahexylsexithiophene, is intense, hence guaranteeing a complete Foerster transfer even at low content of the latter. Optical microscopy investigations together with XRD analysis allowed us to get in sight onto both the structure orientation and the morphology of the film components. The optical aspects of this thin layers, 15-30 nm thick, are also discussed and compared with the mono-component films obtained in the same conditions. LED prototypes were prepared and compared with analogous devices obtained by spin-coating technique. The intimate structure/morphology can readily account for the better performance of LED devices obtained by high-vacuum evaporation. (C) 2004 Elsevier B.V. All rights reserved.
引用
收藏
页码:59 / 65
页数:7
相关论文
共 23 条
  • [11] Ultrathin organic films grown by organic molecular beam deposition and related techniques
    Forrest, SR
    [J]. CHEMICAL REVIEWS, 1997, 97 (06) : 1793 - 1896
  • [12] Doped thin films of two organic molecules for light-emitting diodes
    Giovanella, U
    Botta, C
    Pasini, M
    Porzio, W
    Destri, S
    [J]. APPLIED PHYSICS LETTERS, 2003, 83 (21) : 4318 - 4320
  • [13] A glass-forming conjugated main-chain liquid crystal polymer for polarized electroluminescence applications
    Grell, M
    Bradley, DDC
    Inbasekaran, M
    Woo, EP
    [J]. ADVANCED MATERIALS, 1997, 9 (10) : 798 - &
  • [14] Lakowicz J.R., 2004, PRINCIPLES FLUORESCE, V3rd
  • [15] LEISING G, 1998, HDB CONDUCTING POLYM, P847
  • [16] Forster energy transfer and control of the luminescence in blends of an orange-emitting poly(p-phenylenevinylene) and a red-emitting tetraphenylporphyrin
    Morgado, J
    Cacialli, F
    Iqbal, R
    Moratti, SC
    Holmes, AB
    Yahioglu, G
    Milgrom, LR
    Friend, RH
    [J]. JOURNAL OF MATERIALS CHEMISTRY, 2001, 11 (02) : 278 - 283
  • [17] Bridging the gap - structure determination of the red polymorph of tetrahexylsexithiophene by Monte Carlo simulated annealing, first-principles DFT calculations and Rietveld refinement
    Neumann, MA
    Tedesco, C
    Destri, S
    Ferro, DR
    Porzio, W
    [J]. JOURNAL OF APPLIED CRYSTALLOGRAPHY, 2002, 35 : 296 - 303
  • [18] PORZIO W, IN PRESS THIN SOLID
  • [19] TUBINO R, 1998, OPT MATER, V12, P301
  • [20] Yu WL, 2000, ADV MATER, V12, P828, DOI 10.1002/(SICI)1521-4095(200006)12:11<828::AID-ADMA828>3.0.CO