Source: http://www.google.com/patents/US7959993?dq=5,884,271
Timestamp: 2017-03-23 05:05:09
Document Index: 258175152

Matched Legal Cases: ['Application No. 10', 'Application No. 200510123312', 'Application No. 2004', 'Application No. 2005', 'Application No. 200510123312', 'Application No. 2005']

Patent US7959993 - Small molecular organic electroluminescent display device and method of ... - Google PatentsSearch Images Maps Play YouTube News Gmail Drive More »Sign inPatentsAn organic electroluminescent display (OELD) device and a method of fabricating the same are disclosed. The OELD device includes a substrate, a first electrode, an organic layer containing at least one light emitting layer, and a second electrode. The light emitting layer is comprised of at least one...http://www.google.com/patents/US7959993?utm_source=gb-gplus-sharePatent US7959993 - Small molecular organic electroluminescent display device and method of fabricating the sameAdvanced Patent SearchTry the new Google Patents, with machine-classified Google Scholar results, and Japanese and South Korean patents.Publication numberUS7959993 B2Publication typeGrantApplication numberUS 12/385,309Publication dateJun 14, 2011Filing dateApr 3, 2009Priority dateNov 17, 2004Fee statusPaidAlso published asCN1780019A, CN100565962C, US7579772, US20060103298, US20090197497Publication number12385309, 385309, US 7959993 B2, US 7959993B2, US-B2-7959993, US7959993 B2, US7959993B2InventorsJun-Yeob LeeOriginal AssigneeSamsung Mobile Display Co., Ltd.Export CitationBiBTeX, EndNote, RefManPatent Citations (16), Non-Patent Citations (5), Referenced by (2), Classifications (11), Legal Events (2) External Links: USPTO, USPTO Assignment, EspacenetSmall molecular organic electroluminescent display device and method of fabricating the same
US 7959993 B2Abstract
An organic electroluminescent display (OELD) device and a method of fabricating the same are disclosed. The OELD device includes a substrate, a first electrode, an organic layer containing at least one light emitting layer, and a second electrode. The light emitting layer is comprised of at least one phosphorescent dopant and at least two host materials.
preparing a target substrate; and
forming an organic layer on the target substrate, the organic layer including at least a light emitting layer, the organic layer comprising at least one phosphorescent dopant, a first host material, and a second host material, the first host material and the second host material mixed at weight ratio of 1:0.3 to 1:3.
2. The method of claim 1, wherein the light emitting layer is formed using laser induced thermal imaging (LITI).
3. The method of claim 2, wherein the target substrate comprises an insulating substrate, a first electrode on the insulating substrate, and a pixel defining layer on the first electrode, and the step of forming the organic layer comprises:
preparing a donor substrate comprising a base layer, a light-to-heat conversion layer formed on the base layer, and a transfer layer formed on the light-to-heat conversion layer, the transfer layer comprising at least one phosphorescent dopant, a first host material and a second host material;
positioning the transfer layer of the donor substrate to face the pixel defining layer of the target substrate; and
irradiating a predetermined region of the donor substrate with laser to transfer the transfer layer to the target substrate.
4. The method of claim 1, wherein the first host material is at least one selected from the group consisting of carbazoles, arylamines, hydrazones, and starbursts.
5. The method of claim 1, wherein the second host material is at least one selected from the group consisting of an organic metal, oxadiazoles, triazoles, triazines, and spirofluorenes.
6. A donor substrate, comprising:
a light-to-heat conversion layer formed on the base layer; and
a transfer layer formed on the light-to-heat conversion layer, the transfer layer comprising at least one phosphorescent dopant, a first host material and a second host material, the first host material and the second host material mixed at weight ratio of 1:0.1 to 1:10, the first host material selected from the group consisting of 1,3,5-triscarbazolylbenzene, 4,4′biscarbazolylbiphenyl, polyvinylcarbazole, m-biscarbazolylphenyl, 4,4′-biscarbazolyl-2,2′-dimethylbiphenyl, 4,4′,4″-tri(N-carbazolyl)triphenylamine, 1,3,5-tris(2-carbazolylphenyl) benzene, 1,3,5-tris(2-carbazolyl-5-methoxyphenyl)benzene, and bi(4-carbazolylphenyl)silane.
7. The substrate of claim 6, wherein the second host material suppresses crystallization occurrence of the first host material and has electron transporting characteristics.
8. The substrate of claim 6, wherein the first host material is at least one selected from the group consisting of carbazoles, arylamines, hydrazones, and starbursts.
9. The substrate of claim 6, wherein the second host material is at least one selected from the group consisting of an organic metal, oxadiazoles, triazoles, triazines, and spirofluorenes.
10. The substrate of claim 6, wherein the first host material and the second host material are mixed at weight ratio of 1:0.3 to 1:3.
11. The substrate of claim 6, further comprising at least one of a gas generation layer, a buffer layer, and a metal reflecting layer between the light-to-heat conversion layer and the transfer layer.
12. The donor substrate of claim 6, wherein the phosphorescent dopant is an organic metal complex containing one selected from the group consisting of Pt, Ir, Tb, and Eu.
13. The donor substrate of claim 6, wherein the second host material is selected from the group consisting of bis(8-hydroxyquinolato)biphenoxy aluminum, bis(8hydroxyquinolato)phenoxy aluminum, bis(2-methyl-8-hydroxyquinolato)biphenoxy aluminum, bis(2-methyl-8-hydroxyquinolato)phenoxy aluminum, bis(2-(2-hydroxyphenyl)quinolato)zinc, (4-biphenylyl)-5-(4-tertbutylphenyl)-1,3,4-oxadiazole, 3-phenyl-4-(1′-naphthyl)-5-phenyl-1,2,4-triazole, 2,9-dimethyl-4,7-diphenyl-9,10-phenanthroline, 2,4,6-tris (diallylamino)-1,3,5-trazin and 1,4-bisspirofluorenylbenzene.
14. A donor substrate, comprising:
a transfer layer formed on the light-to-heat conversion layer, the transfer layer comprising at least one phosphorescent dopant, a first host material and a second host material, the first host material and the second host material mixed at weight ratio of 1:0.3 to 1:3.
This application claims the benefit of Korean Patent Application No. 10-2004-0094365, filed Nov. 17, 2004, the disclosure of which is hereby incorporated herein by reference in its entirety. Furthermore, this application is a divisional of Applicants' Ser. No. 11/272,680 now U.S. Pat. No. 7,579,772 filed in the U.S. Patent & Trademark Office on 15 Nov. 2005, and assigned to the assignee of the present invention.
The present invention relates to an organic electroluminescent display (“OELD”) device and a method of fabricating the same and, more particularly, to a small molecular OELD device which is fabricated by using a mixture of a phosphorescent dopant and at least two hosts and a method of fabricating the same.
In case of a full color device, light emitting layers which represent red (R), green (G) and blue (B) colors are patterned to implement a full color, and the patterning of the light emitting layers is carried out by an ink jet printing or laser induced thermal imaging (hereinafter will be referred to as “LITI”). The LITI can use a spin coating characteristic “as is” and so has high pixel inside uniformity even in case of a large-sized device. The LITI is not a wet etching technique but a dry etching technique, and so it can resolve a problem caused by a solvent which may lower a device life span, and it can finely pattern the organic layer. In case where a plurality of organic layers having at least a light emitting layer are stacked using a deposition process and a full color is implemented using a shadow mask in the small molecular OELD device, the light emitting layers which implement R, G and B colors are stacked and patterned. In such an instance, a device life span of the small molecular OELD device is more excellent than that of the polymer OELD device, since the multiple layers are formed using a deposition process, but a fabricating process is more complicated because the R, G and B light emitting layers are stacked on respective pixel regions using the shadow mask to implement the full color. In addition, in case of fabricating the large-sized device, the shadow mask may be sagged, leading to misalignment. Further, since a space between the masks may be contaminated, it should be frequently cleaned, which checks a size increasing of device and a mass production. As described above, the small molecular OELD device is excellent in device characteristics but is complicated in fabricating process compared to the polymer OELD device. In order to resolve the problems, a method of fabricating the small molecular OELD device using the LITI has been introduced, so that a device having excellent characteristics and large pixel region can be simply fabricated. As described above, however, in case where the small molecular OELD device is fabricated using the LITI, there is a problem in that the small molecular material is easily crystallized by heat.
It is an object of the present invention to provide an improved OELD device.
Examples 1 to 3 and Comparison Examples 1 to 4
After a cleaning and drying process, N,N′-di(1-naphthyl)-N,N′-diphenylbenzidene (NPD) which serves as a hole injecting layer and a hole transporting layer is deposited on an ITO transparent electrode at thickness of 50 nm in vacuum of 10−6 Torr.
Patent CitationsCited PatentFiling datePublication dateApplicantTitleUS6392250Jun 30, 2000May 21, 2002Xerox CorporationOrganic light emitting devices having improved performanceUS6699597Aug 16, 2001Mar 2, 20043M Innovative Properties CompanyMethod and materials for patterning of an amorphous, non-polymeric, organic matrix with electrically active material disposed thereinUS7045952Mar 4, 2004May 16, 2006Universal Display CorporationOLEDs with mixed host emissive layerUS7175922Oct 22, 2003Feb 13, 2007Eastman Kodak CompanyAggregate organic light emitting diode devices with improved operational stabilityUS7271406 *Apr 15, 2003Sep 18, 20073M Innovative Properties CompanyElectron transport agents for organic electronic devicesUS7507485 *Sep 26, 2002Mar 24, 2009Lg Display Co., Ltd.Organic electroluminescent deviceUS7517593 *Dec 13, 2004Apr 14, 2009Samsung Mobile Display Co., Ltd.Donor substrate for laser induced thermal imaging method and organic electroluminescent display device fabricated using the sameCN1416301AOct 30, 2002May 7, 2003Lg电子株式会社Organic electroluminescent elementCN1453886AApr 24, 2003Nov 5, 2003伊斯曼柯达公司Organic light-emitting diode equipment with improved operation stabilityJP2003068466A Title not availableJP2003229258A Title not availableJP2003229259A Title not availableJP2003347058A Title not availableJP2004071550A Title not availableJPH10208881A Title not availableKR20030097363A Title not available* Cited by examinerNon-Patent CitationsReference1Chinese Patent Registration Gazette issued on Dec. 2, 2009 in the corresponding Chinese Patent Application No. 200510123312.2.2Korean Office Action of the Korean Patent Application No. 2004-0094365, issued on Jun. 20, 2006.3Office action from Japanese Patent Office issued in Applicant's corresponding Japanese Patent Application No. 2005-151497 dated Jun. 3, 2008.4Office action from the State Intellectual Property Office of P.R. China issued in Applicant's corresponding Chinese Patent Application No. 200510123312.2 dated Oct. 17, 2008 (submitted with an English translation).5Transmittal letter and Japanese Office Action issued by Japanese Patent office on Sep. 15, 2009 in the corresponding Japanese Patent Application No. 2005-151497 with English abstract attached.Referenced byCiting PatentFiling datePublication dateApplicantTitleUS8431432Mar 28, 2008Apr 30, 2013Semiconductor Energy Laboratory Co., Ltd.Manufacturing method of light-emitting deviceUS20080268561 *Mar 28, 2008Oct 30, 2008Semiconductor Energy Laboratory Co., Ltd.Manufacturing Method of Light-Emitting Device* Cited by examinerClassifications U.S. Classification428/32.81, 428/690, 156/235, 430/945International ClassificationB41M5/46Cooperative ClassificationH01L51/0081, H01L51/0085, H01L51/5016, H01L2251/5384, Y10S430/146European ClassificationH01L51/50E3Legal EventsDateCodeEventDescriptionSep 21, 2012ASAssignmentOwner name: SAMSUNG DISPLAY CO., LTD., KOREA, REPUBLIC OFFree format text: DIVERSTITURE;ASSIGNOR:SAMSUNG MOBILE DISPLAY CO., LTD.;REEL/FRAME:029087/0636Effective date: 20120702Owner name: SAMSUNG DISPLAY CO., LTD., KOREA, REPUBLIC OFFree format text: MERGER;ASSIGNOR:SAMSUNG MOBILE DISPLAY CO., LTD.;REEL/FRAME:029087/0636Effective date: 20120702Dec 11, 2014FPAYFee paymentYear of fee payment: 4RotateOriginal ImageGoogle Home - Sitemap - USPTO Bulk Downloads - Privacy Policy - Terms of Service - About Google Patents - Send FeedbackData provided by IFI CLAIMS Patent Services