Electron Transport Materials for Organic Light-Emitting Diodes: Understanding the Crystal and Molecular Stability of the Tris(8-hydroxyquinolines) of Al, Ga, and In

• Type: Article in International Scientific Journal
• Date: 2014

Authors

Costa, JCS (Author) FCUP; Carlos F R A C Lima (Author) Other; Luis M N B F Santos (Author) FCUP

Journal

Title: Journal of Physical Chemistry C

Vol. 118

Pages: 21762-21769

ISSN: 1932-7447

Publisher: American Chemical Society

Indexing

ISI Web of Knowledge - 26 Citations

Scopus - 27 Citations

Scientific classification

FOS: Engineering and technology > Materials engineering

Other information

Authenticus ID: P-009-VGN

DOI: 10.1021/jp503935k

Abstract (EN): An experimental and theoretical study on the phase and molecular stability of Mq(3) (M = Al, Ga, and In; q = 8-hydroxyquinoline) is presented. The results suggest that the energy difference between the meridional and facial isomers of Mq(3) shall be significantly lower than previously though and provide an explanation for the reported mer-fac solid-solid transition. The first accurate vapor pressure measurements for Alq(3), Gaq(3), and Inq(3) are presented, which are of great relevance for the manufacturing of thin films by vacuum deposition. Phase transition thermodynamics indicates higher cohesive energies of the mer-isomers and an entropic differentiation that can be associated with the different molecular symmetry of the mer- and fac-isomers.

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 8