Preparation and characterization of high efficient blue-light emitting materials with a secondary ligand for organic electroluminescence

Citation
Y. Qiu et al., Preparation and characterization of high efficient blue-light emitting materials with a secondary ligand for organic electroluminescence, JPN J A P 1, 39(3A), 2000, pp. 1151-1153
Citations number
13
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Apllied Physucs/Condensed Matter/Materiales Science
Volume
39
Issue
3A
Year of publication
2000
Pages
1151 - 1153
Database
ISI
SICI code
0021-4922(200003)39:3A<1151:PACOHE>2.0.ZU;2-8
Abstract
In this paper, a blue light emitting material, bis(2-methyl-quinolinolato)( phenolato) aluminum(III) (Alq(2)'OPh), was synthesized. Organic electrolumi nescent (EL) devices have been fabricated with the homemade organometallic compound as the emitting layer and N,N'-diphenyl-N,N'-di(m-tolyl)benzidinev (TPD) as the hole transport layer, blue light emission with a high efficie ncy was obtained. Compared with tris (8-hydroxyquinoline) aluminum (Alq(3)) , the presence of the phenolate ligand shifts the light emission to the blu e region of the spectrum. The maximum wavelength of the EL is at around 495 nm and the brightness is up to 4000 cd/m(2) with the maximum efficiency up to 1.41 m/W. Two new compounds have also been prepared in order to investi gate the effect of the secondary ligand. The comparison study indicates tha t the organometallic compound with a secondary ligand, not only the sterica l effect but also some other effect would be responsible for the change of the emission wavelength.