Electroluminescent Device
US-2016359143-A1 · Dec 8, 2016 · US
Organic light emitting device which emits white light
US10770686B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-10770686-B2 |
| Application number | US-201615762245-A |
| Country | US |
| Kind code | B2 |
| Filing date | Aug 11, 2016 |
| Priority date | Sep 22, 2015 |
| Publication date | Sep 8, 2020 |
| Grant date | Sep 8, 2020 |
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Abstract
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An organic light emitting device which emits white light in use, comprising a reflective anode (3), a first light emitting layer (9) which emits red light located over said anode, a second light emitting layer (11) which emits blue light and green light located over said first light emitting layer, and a cathode structure located over said second light emitting layer comprising a first semi-reflecting layer (15) and a second semi-reflecting layer (21) with a layer (19) of light transmissive material between the first and second semi-reflecting semi-transparent layers, the distance between the reflective anode (3) and the first semi-reflecting semi-transparent layer (17) being selected to form a micro-cavity which enhances blue light emission and red light emission from the device, and the distance between the reflective anode (3) and the second semi-reflecting semi-transparent layer (21) being selected to enhance green light emission from the device.
First claim
Opening claim text (preview).
The invention claimed is: 1. An organic light emitting device which emits white light, comprising: a reflective anode, a first light emitting layer which emits red light located over said reflective anode, a second light emitting layer which emits blue light and green light located over said first light emitting layer, and a cathode structure located over said second light emitting layer comprising: a first semi-reflecting semi-transparent layer; and a second semi-reflecting semi-transparent layer with a layer of light transmissive material between the first and second semi-reflecting semi-transparent layers, wherein a first distance between the reflective anode and the first semi-reflecting semi-transparent layer is selected to form a first micro-cavity which enhances blue light emission and red light emission from the organic light emitting device, and wherein a second distance between the reflective anode and the second semi-reflecting semi-transparent layer is selected to form a second micro-cavity which enhances green light emission from the organic light emitting device. 2. The organic light emitting device as claimed in claim 1 in which the reflective anode is carried by a substrate, and the white light is emitted out of the organic light emitting device through the cathode structure. 3. The organic light emitting device as claimed in claim 1 in which the first distance between the reflective anode and the first semi-reflecting semi-transparent layer is in a range 330 to 370 nm. 4. The organic light emitting device as claimed in claim 3 in which the first distance between the reflective anode and the first semi-reflecting semi-transparent layer is between 345 and 355 nm. 5. The organic light emitting device as claimed in claim 3 in which a refractive index of the first light emitting layer is in a range 1.55 to 1.67. 6. The organic light emitting device as claimed in claim 5 in which a refractive index of the second light emitting layer is in a range 1.55 to 1.67. 7. The organic light emitting device as claimed in claim 2 in which the first distance between the reflective anode and the first semi-reflecting semi-transparent layer is in a range 330 to 370 nm.
Assignees
Inventors
Classifications
Reflective anodes, e.g. ITO combined with thick metallic layers · CPC title
- H10K50/852Primary
comprising a resonant cavity structure, e.g. Bragg reflector pair · CPC title
- H10K50/13Primary
comprising stacked EL layers within one EL unit · CPC title
Electricity · mapped topic
- H01L51/5265Primary
Electricity · mapped topic
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- What does patent US10770686B2 cover?
- An organic light emitting device which emits white light in use, comprising a reflective anode (3), a first light emitting layer (9) which emits red light located over said anode, a second light emitting layer (11) which emits blue light and green light located over said first light emitting layer, and a cathode structure located over said second light emitting layer comprising a first semi-ref…
- Who is the assignee on this patent?
- Cambridge Display Tech Ltd
- What technology area does this patent fall under?
- Primary CPC classification H10K50/852. Mapped technology areas include Electricity.
- When was this patent published?
- Publication date Tue Sep 08 2020 00:00:00 GMT+0000 (Coordinated Universal Time) (B2). Legal status and post-grant events are not shown on this page.
- What related patents are in patentsdb?
- We list 5 related publications on this page (citations in our corpus or others sharing the same primary CPC).