Device containing green organic light-emitting diode
AssigneeEastman Kodak Company
InventorsLelia Cosimbescu, Jianmin Shi
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Abstract
Disclosed is an OLED device comprising a non-gallium host compound and a green light emitting dopant wherein the dopant comprises an N,N′-diarylquinacridone compound optionally containing on the two aryl groups and the quinacridone nucleus only substituent groups having Hammett's σ constant values at least 0.05 more positive than that for a corresponding methyl group, such substituent groups including up to two substituent groups directly on the carbon members of the quinacridone nucleus, provided that said substituent groups do not form a ring fused to the five-ring quinacridone nucleus. Such a device exhibits improved stability, and at the same time, provides high efficiency and good color.
Claims20
1 An OLED device comprising a non-gallium host compound and a green light emitting dopant wherein the dopant comprises an N,N′-diarylquinacridone compound optionally containing on the two aryl groups and the quinacridone nucleus only substituent groups having Hammett's σ constant values at least 0.05 more positive than that for a corresponding methyl group, such substituent groups including up to two substituent groups directly on the carbon members of the quinacridone nucleus, provided that said substituent groups do not form a ring fused to the five-ring quinacridone nucleus.
The device of claim 1 wherein the N,N′-diarylquinacridone compound is unsubstituted.
The device of claim 1 wherein the host comprises Alq, ADN, or TBADN.
The device of claim 1 wherein the host comprises a co-host comprising Alq
The device of claim 1 wherein the host comprises a co-host comprising Alq and TBADN.
The device of claim 1 wherein the dopant is present in an amount of less than a 10 wt %, ratio to host.
The device of claim 1 wherein the dopant is present in an amount of less than a 2 wt % ratio to host.
The device of claim 1 wherein the dopant is present in an amount of 0.1 to 1 wt % ratio to host.
The device of claim 1 wherein the substituents are selected so that the device emits green light having a CIEx value less than 0.35, a CIEy value greater than 0.62, and a luminance efficiency greater than 7 cd/A when applied with a current density of 20 mA/cm2.
12 The OLED device of claim 1 wherein the dopant has the following formula:
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- wherein, R1 and R2 represent one or more independently selected hydrogen or substituent groups having Hammett's σ constant values at least 0.05 more positive than that for a corresponding methyl group and each of R3 through R6 represents hydrogen or up to two substituents as selected for R1 above.
The device of claim 12 wherein R1 and R2 are hydrogen or independently selected from halogen, aryl, an aromatic heterocycle, or a fused aromatic or heteroaromatic ring.
The device of claim 12 wherein R3 through R6 represents hydrogen or one or more substituents independently selected from halogen, aryl, and an aromatic heterocycle.
The device of claim 12 wherein R1-R6 are independently selected hydrogen, phenyl, biphenyl, or naphthyl groups.
The device of claim 12 wherein the dopant is present in an amount of 0.1 to 1 wt % ratio to host.
An OLED device comprising a cathode, an anode and having located between the cathode and electrode a non-gallium host compound and a green light emitting dopant wherein the dopant comprises an N,N′-diarylquinacridone compound optionally containing on the two aryl groups and the quinacridone nucleus only substituent groups having Hammett's σ constant values at least 0.05 more positive than that for a corresponding methyl group, such substituent groups including up to two substituent groups directly on the carbon members of the quinacridone nucleus, provided that said substituent groups do not form a ring fused to the five-ring quinacridone nucleus.
A display device comprising the OLED device of claim 1.
Dependencies are inferred from the claim text.