公开(公告)号：US20170186980A1

公开(公告)日：2017-06-29

申请号：US15392135

申请日：2016-12-28

申请人： Semiconductor Energy Laboratory Co., Ltd.

发明人： Takeyoshi Watabe ,  Satoko SHITAGAKI ,  Kunihiko SUZUKI ,  Harue OSAKA ,  Satomi MITSUMORI ,  Satoshi SEO

IPC分类号： H01L51/00 ,  C09K11/06 ,  C09K11/02 ,  H01L27/32

CPC分类号： H01L51/0074 ,  C09K11/025 ,  C09K11/06 ,  C09K2211/1007 ,  C09K2211/1059 ,  C09K2211/185 ,  H01L27/322 ,  H01L27/323 ,  H01L51/0061 ,  H01L51/0067 ,  H01L51/0072 ,  H01L51/0085 ,  H01L51/5012 ,  H01L51/5016

摘要： A light-emitting element with high emission efficiency and high reliability is provided. The light-emitting element includes a light-emitting layer containing a first organic compound, a second organic compound, and a guest material. The first organic compound has a nitrogen-containing six-membered heteroaromatic skeleton. In the light-emitting layer, the weight ratio of an organic compound having a nitrogen-containing five-membered heterocyclic skeleton with an NH group, a secondary amine skeleton with an NH group, or a primary amine skeleton with an NH group to the first organic compound is less than or equal to 0.03, or alternatively, the weight ratio of the organic compound having a nitrogen-containing five-membered heterocyclic skeleton with an NH group, a secondary amine skeleton with an NH group, or a primary amine skeleton with an NH group to the second organic compound is less than or equal to 0.01.

公开(公告)号：US09634267B2

公开(公告)日：2017-04-25

申请号：US15204363

申请日：2016-07-07

申请人： Semiconductor Energy Laboratory Co., Ltd.

发明人： Takeyoshi Watabe ,  Satoshi Seo

IPC分类号： H01L51/00 ,  H01L51/50 ,  H01L27/32

CPC分类号： H01L51/5028 ,  H01L27/3244 ,  H01L51/0052 ,  H01L51/0059 ,  H01L51/006 ,  H01L51/0061 ,  H01L51/0072 ,  H01L51/0074 ,  H01L51/0085 ,  H01L51/5016 ,  H01L2251/5361 ,  H01L2251/5384 ,  H01L2251/55 ,  H01L2251/556

摘要： A light-emitting element of the present invention can have sufficiently high emission efficiency with a structure including a host material being able to remain chemically stable even if a phosphorescent compound having higher emission energy is used as a guest material. The relation between the relative emission intensity and the emission time of light emission obtained from the host material and the guest material contained in a light-emitting layer is represented by a multicomponent decay curve. The relative emission intensity of the slowest component of the multicomponent decay curve becomes 1/100 for a short time within a range where the slowest component is not interfered with by quenching of the host material (the emission time of the slowest component is preferably less than or equal to 15 μsec); thus, sufficiently high emission efficiency can be obtained.

公开(公告)号：US20170092889A1

公开(公告)日：2017-03-30

申请号：US15278750

申请日：2016-09-28

申请人： Semiconductor Energy Laboratory Co., Ltd.

发明人： Satoshi Seo ,  Takeyoshi Watabe ,  Satomi Mitsumori

IPC分类号： H01L51/50 ,  C09K11/02 ,  C07D403/12 ,  C07D241/38 ,  C07D405/10 ,  C09K11/06 ,  H01L51/00

CPC分类号： H01L51/5004 ,  C07D241/38 ,  C07D403/12 ,  C07D405/10 ,  C09K11/02 ,  C09K11/06 ,  C09K2211/1007 ,  C09K2211/1011 ,  C09K2211/1014 ,  C09K2211/1022 ,  C09K2211/1029 ,  C09K2211/1033 ,  C09K2211/1044 ,  C09K2211/1048 ,  C09K2211/1051 ,  C09K2211/1059 ,  C09K2211/1088 ,  C09K2211/1092 ,  C09K2211/185 ,  C09K2211/188 ,  H01L27/3211 ,  H01L51/0052 ,  H01L51/006 ,  H01L51/0061 ,  H01L51/0072 ,  H01L51/0073 ,  H01L51/0085 ,  H01L51/5016 ,  H01L51/5044 ,  H01L2251/5376 ,  H01L2251/5384 ,  H01L2251/552 ,  Y02P20/582

摘要： To provide a light-emitting element with high emission efficiency and low driving voltage. The light-emitting element includes a guest material and a host material. A LUMO level of the guest material is lower than a LUMO level of the host material. An energy difference between the LUMO level and a HOMO level of the guest material is larger than an energy difference between the LUMO level and a HOMO level of the host material. The guest material has a function of converting triplet excitation energy into light emission. An energy difference between the LUMO level of the guest material and the HOMO level of the host material is larger than or equal to energy of light emission of the guest material.

公开(公告)号：US09461259B2

公开(公告)日：2016-10-04

申请号：US14718689

申请日：2015-05-21

申请人： Semiconductor Energy Laboratory Co., Ltd.

发明人： Takeyoshi Watabe ,  Satoshi Seo

IPC分类号： H01L51/00 ,  H01L51/50

CPC分类号： H01L51/504 ,  C09K11/025 ,  C09K11/06 ,  C09K2211/1007 ,  C09K2211/1044 ,  C09K2211/185 ,  H01L51/0052 ,  H01L51/006 ,  H01L51/0061 ,  H01L51/0072 ,  H01L51/0074 ,  H01L51/0085 ,  H01L51/5004 ,  H01L51/5012 ,  H01L51/5016 ,  H01L51/5036 ,  H01L2251/552

摘要： Provided is a light-emitting element having a light-emitting layer which contains at least a host material and a plurality of guest materials, where the host material has a lower T1 level than that of at least one of the plurality of guest materials. The emission of the one of the plurality of guest materials exhibits a multicomponent decay curve, and the lifetime thereof is less than or equal to 15 μsec, preferably less than or equal to 10 μsec, more preferably less than or equal to 5 μsec, where the lifetime is defined as a time for the emission to decrease in intensity to 1/100 of its initial intensity.

公开(公告)号：US20160093823A1

公开(公告)日：2016-03-31

申请号：US14868724

申请日：2015-09-29

申请人： Semiconductor Energy Laboratory Co., LTD.

发明人： Satoshi Seo ,  Nobuharu Ohsawa ,  Takeyoshi Watabe

IPC分类号： H01L51/50 ,  H01L51/52

CPC分类号： H01L51/5016 ,  H01L27/3209 ,  H01L51/0054 ,  H01L51/0058 ,  H01L51/006 ,  H01L51/0067 ,  H01L51/0072 ,  H01L51/0074 ,  H01L51/5004 ,  H01L51/5012 ,  H01L51/5028 ,  H01L51/5278 ,  H01L2251/5376 ,  H01L2251/5384

摘要： Provided is a light-emitting element including a fluorescence-emitting material with high emission efficiency. The light-emitting element includes a pair of electrodes and an EL layer between the pair of electrodes. The EL layer includes a first organic compound, a second organic compound, and a guest material. The first organic compound has a function of emitting a thermally activated delayed fluorescence at room temperature. The guest material has a function of emitting fluorescence. A HOMO level of the first organic compound higher than or equal to a HOMO level of the second organic compound. A LUMO level of the first organic compound is lower than or equal to a LUMO level of the second organic compound.

摘要翻译： 提供了包括具有高发光效率的荧光发射材料的发光元件。 发光元件包括一对电极和一对电极之间的EL层。 EL层包括第一有机化合物，第二有机化合物和客体材料。 第一有机化合物具有在室温下发出热激活延迟荧光的功能。 客体材料具有发射荧光的功能。 所述第一有机化合物的HOMO含量高于或等于所述第二有机化合物的HOMO能级。 第一有机化合物的LUMO含量低于或等于第二有机化合物的LUMO能级。