Organic electroluminescence device

Details Organic electroluminescence device Organic electroluminescence device

1997-01-22

1999-09-28

Nold, Charles

Stock material or miscellaneous articles

Composite

Of inorganic material

428917, 313503, 313504, 313506, H05B 3314

Patent

active

059586095

ABSTRACT:
An organic electroluminescence device which has a pair of electrodes, at least one of which is transparent or semitransparent, and at least one organic layer formed between the electrodes. The organic layer contains a hole transporting material and a light emitting material in the same or different layer. The hole transporting material contains at least one polysilane whose main chain skeleton is composed of a repeating unit represented by the general formula (1) and a repeating unit represented by the general formula (2): ##STR1## wherein R.sub.1, R.sub.2, R.sub.3 and R.sub.4 independently represent a substituted or unsubstituted alkyl group, a substituted or unsubstituted cycloalkyl group, a substituted or unsubstituted aryl group or a substituted or unsubstituted aralkyl group, Ar.sub.1 represents a substituted or unsubstituted arylene group and Ar.sub.2 represents a substituted or unsubstituted aryl group. The polysilane satisfies the expression 0.2.ltoreq.z.ltoreq.1 where a ratio of the number of the repeating unit (1) and that of the repeating unit (2) to the total number of the repeating units (1) and (2) are z and 1-z, respectively. The polysilane has a weight average molecular weight of not less than 5000 and a hole drift mobility of 10.sup.-3 -10.sup.-1 cm.sup.2 /v/sec. The organic EL device shows excellent characteristics of higher luminance and higher luminous efficiency at lower driving voltage.

REFERENCES:
Suzuki et al., `Behavior of Charge Carriers and Excitons in Multilayer Organic Light-Emitting Diodes Made from a Polysilane Polymer as Monitored with Elctroluminescence`, Journal of Applied Physics, vol. 79, No. 2, pp. 858-865 (Jan. 1996).
Patent Abstracts of Japan, vol. 017, No. 394 (C-1088), Jul. 21, 1993 & JP 05 070772 A.
Database WPI, Section Ch, Week 9502, Derwent Publications Ltd., London, GB, Class E11, AN 95-009629.

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