Organic electroluminescence device
AssigneeIdemitsu Kosan Co., Ltd.
InventorsHisahiro Higashi, Toshio Sakai, Chishio Hosokawa
Life of this patent
Estimating the term…
Abstract
The invention is an organic electroluminescent device that comprises organic compound layer(s) including at least one organic emitting layer sandwiched between a pair of electrodes, wherein at least one organic compound layer is formed from an organic compound material having an impurity concentration of lower than 1000 ppm. The device has the advantages of applicability to lightweight, thin and low-voltage driving displays, good luminescent capacity attenuating little even in long-term driving operation, and good durability.
Claims32
An organic electroluminescent device that comprises organic compound layer(s) including at least one organic emitting layer sandwiched between a pair of electrodes, wherein at least one organic compound layer is formed from an organic compound material having an impurity concentration of lower than 1000 ppm,
- and wherein said organic emitting layer comprises at least one light emitting material selected from the group consisting of (a), (b), (c), (d), (e), (f) and combinations thereof:
- wherein in (a), R1 and R2 may be the same or different and each independently represents an alkyl group, a cycloalkyl group, an aryl group, an alkenyl group, an alkoxy group, an aryloxy group, an amino group, or a heterocyclic group;
- r1 and r2 each is 0 or an integer of from 1 to 5;
- wherein when r1 and r2 each are an integer of 2 or more, the groups of R1's and R2's each may be the same or different, and R1's and R2's may be bonded to each other to form a ring;
- L1 represents a single bond or an arylene group, and the arylene group may be interrupted by an alkylene group, —O—, —S— or —NR—, wherein R is an alkyl or aryl group;
- wherein in (b), R3 and R4 may be the same or different, and each independently represents an alkyl group, a cycloalkyl group, an aryl group, an alkenyl group, an alkoxy group, an aryloxy group, an amino group, or a heterocyclic group;
- r3 and r4 each is 0 or an integer of from 1 to 5;
- wherein when r3 and r4 each are an integer of 2 or more, the groups of R3's and R4's each may be the same or different, and R3's and R4's may be bonded to each other to form a ring;
- L2 represents a single bond or an arylene group, and the arylene group may be interrupted by an alkylene group, —O—, —S— or —NR—, wherein R indicates an alkyl or aryl group;
- wherein in (c), A1 to A4 each independently represent an aryl group having from 6 to 16 carbon atoms, which aryl group may be substituted with a hydrogen atom, an alkyl group, an alkoxy group, an aryl group or an amino group;
- and A represents a single bond or an optionally-substituted arylene or polyarylene group;
- wherein in (d), Ar represents an arylene or polyarylene group;
- R1 to R3 each represent a hydrogen atom, an alkyl group or an aryl group;
- and n is an integer of from 1 to 6;
- wherein in (e), Ar1 to Ar4 each represent an aryl group, at least one of which is substituted with the following group:
- wherein R1 to R3 each represent a hydrogen atom, an alkyl group, or an aryl group;
- and wherein in (f), Ar′, Ar″, X and Y each represent an aryl group.
An organic electroluminescent device that comprises organic compound layer(s) including at least one organic emitting layer sandwiched between a pair of electrodes, wherein at least one organic compound layer is formed from an organic compound material having an impurity concentration of lower than 500 ppm and the impurity therein is a halogen containing compound,
- and wherein said organic emitting layer comprises at least one light emitting material selected from the group consisting of (a), (b), (c), (d), (e), (f) and combinations thereof:
- wherein in (a), R1 and R2 may be the same or different and each independently represents an alkyl group, a cycloalkyl group, an aryl group, an alkenyl group, an alkoxy group, an aryloxy group, an amino group, or a heterocyclic group;
- r1 and r2 each is 0 or an integer of from 1 to 5;
- wherein when r1 and r2 each are an integer of 2 or more, the groups of R1's and R2's each may be the same or different, and R1's and R2's may be bonded to each other to form a ring;
- L1 represents a single bond or an arylene group, and the arylene group may be interrupted by an alkylene group, —O—, —S— or —NR—, wherein R is an alkyl or aryl group;
- wherein in (b), R3 and R4 may be the same or different, and each independently represents an alkyl group, a cycloalkyl group, an aryl group, an alkenyl group, an alkoxy group, an aryloxy group, an amino group, or a heterocyclic group;
- r3 and r4 each is 0 or an integer of from 1 to 5;
- wherein when r3 and r4 each are an integer of 2 or more, the groups of R3's and R4's each may be the same or different, and R3's and R4's may be bonded to each other to form a ring;
- L2 represents a single bond or an arylene group, and the arylene group may be interrupted by an alkylene group, —O—, —S— or —NR—, wherein R indicates an alkyl or aryl group;
- wherein in (c), A1 to A4 each independently represent an aryl group having from 6 to 16 carbon atoms, which aryl group may be substituted with a hydrogen atom, an alkyl group, an alkoxy group, an aryl group or an amino group;
- and A represents a single bond or an optionally-substituted arylene or polyarylene group;
- wherein in (d), Ar represents an arylene or polyarylene group;
- R1 to R3 each represent a hydrogen atom, an alkyl group or an aryl group;
- and n is an integer of from 1 to 6;
- wherein in (e), Ar1 to Ar4 each represent an aryl group, at least one of which is substituted with the following group:
- wherein R1 to R3 each represent a hydrogen atom, an alkyl group, or an aryl group;
- and wherein in (f), Ar′, Ar″, X and Y each represent an aryl group.
A method for selecting organic compound materials for organic electroluminescent devices, comprising determining, through high-performance liquid chromatography, the impurity content of each organic compound material to form organic compound layers for the devices, selecting those having an impurity content of smaller than 1000 ppm out of the materials analyzed, and using the thus-selected materials for forming the organic compound layers.
A method for selecting organic compound materials for organic electroluminescent devices, comprising determining the impurity content of at least one organic compound material to form organic compound layers for the devices, selecting those having an impurity content of smaller than 1000 ppm out of the materials analyzed, and using the thus-selected materials for forming the organic compound layers.
Dependencies are inferred from the claim text.