Effects of thermal annealing on the photophysical properties of bisfluorene-cored dendrimer films

Ribierre, J.C., Ruseckas, A., Gaudin, O.P.M., Samuel, I.D.W., Barcena, H., Staton, S.V. and Burn, P.L. (2009) Effects of thermal annealing on the photophysical properties of bisfluorene-cored dendrimer films. Organic Electronics, 10 5: 803-808. doi:10.1016/j.orgel.2009.03.018


Author Ribierre, J.C.
Ruseckas, A.
Gaudin, O.P.M.
Samuel, I.D.W.
Barcena, H.
Staton, S.V.
Burn, P.L.
Title Effects of thermal annealing on the photophysical properties of bisfluorene-cored dendrimer films
Journal name Organic Electronics   Check publisher's open access policy
ISSN 1566-1199
Publication date 2009-04-09
Year available 2009
Sub-type Article (original research)
DOI 10.1016/j.orgel.2009.03.018
Volume 10
Issue 5
Start page 803
End page 808
Total pages 6
Editor A Kahn
C Adachi
S R Forrest
Place of publication Netherlands
Publisher Elsevier B.V.
Language eng
Subject C1
970102 Expanding Knowledge in the Physical Sciences
970103 Expanding Knowledge in the Chemical Sciences
030303 Optical Properties of Materials
030505 Physical Organic Chemistry
020504 Photonics, Optoelectronics and Optical Communications
020499 Condensed Matter Physics not elsewhere classified
091208 Organic Semiconductors
Abstract Annealing is widely used in the processing of organic semiconductors, and can modify their film morphology and photophysical properties. A study of the effect of annealing on films made from a blue emitting bisfluorene-cored dendrimer is reported. Annealing causes a 15 nm blue-shift in the photoluminescence (PL) spectrum and an 11 nm blue-shift in the amplified spontaneous emission (ASE) spectrum. It causes the PL efficiency to decrease only slightly from 0.92 to 0.83. The radiative decay rate of 1.3 × 109 s−1, the ASE threshold of 1.5 × 1018 cm−3 and the singlet–singlet exciton annihilation rate of 5.5 × 10−10 cm3 s−1 are unaffected by annealing. The results indicate a scope for colour adjustment of dendrimer light-emitting diodes and lasers without affecting their efficiencies. Investigation by spectroscopic ellipsometry shows that on annealing, the films become anisotropic, with larger values of the refractive index and extinction coefficient observed for light polarised in the plane of the film than the corresponding out-of-plane values in the absorption region of the bisfluorene core. This anisotropy indicates a preferential in-plane orientation of bisfluorene cores upon annealing.
Keyword Organic semiconductor
Dendrimer
Fluorene
Photophysics
Annealing
Ellipsometry
LIGHT-EMITTING-DIODES
AMPLIFIED SPONTANEOUS EMISSION
EXCITON-EXCITON ANNIHILATION
CONJUGATED POLYMERS
INTERCHAIN INTERACTIONS
ORGANIC SEMICONDUCTOR
HOLE TRANSPORT
MORPHOLOGY
PERFORMANCE
GENERATION
Q-Index Code C1
Q-Index Status Confirmed Code

 
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Created: Fri, 04 Sep 2009, 20:26:18 EST