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Preparation and Characterization of Blue‐Luminescent Tris(8‐hydroxyquinoline)‐aluminum (Alq 3 )
Author(s) -
Cölle M.,
Gmeiner J.,
Milius W.,
Hillebrecht H.,
Brütting W.
Publication year - 2003
Publication title -
advanced functional materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 6.069
H-Index - 322
eISSN - 1616-3028
pISSN - 1616-301X
DOI - 10.1002/adfm.200390015
Subject(s) - materials science , luminescence , annealing (glass) , differential scanning calorimetry , aluminium , 8 hydroxyquinoline , tris , characterization (materials science) , oled , optoelectronics , light emitting diode , blue light , analytical chemistry (journal) , chemical engineering , nanotechnology , organic chemistry , composite material , chemistry , biochemistry , physics , layer (electronics) , engineering , thermodynamics
Using differential scanning calorimetry (DSC) measurements in combination with structural and optical characterization we have investigated the formation conditions of different phases of tris(8‐hydroxyquinoline)aluminum (Alq 3 ). We have identified the δ‐phase as a high‐temperature phase of Alq 3 being composed of the facial stereoisomer, and report an efficient method to obtain blue luminescent Alq 3 by a simple annealing process. This allows the preparation of large amounts of pure δ‐Alq 3 by choosing appropriate annealing conditions, which is necessary for further characterization of this blue‐luminescent phase, and offers the possibility of fabricating blue organic light‐emitting devices (OLEDs) from this material.