Method for improving emission extraction efficiency of organic electroluminescent device and corresponding device
A top-emission and electroluminescence technology, which is applied in the fields of electric solid-state devices, electrical components, semiconductor devices, etc., can solve the problems of complex methods, affecting the electrical performance of devices, and weakening light intensity.
Inactive Publication Date: 2009-02-18
PEKING UNIV
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The two interfaces of the metal top electrode prepared by this method will have the same nanostructure, and it will have the following disadvantages when scattering surface plasmon waves to improve the top emission: one is the symmetry of the two sides of the metal electrode. Both nanostructures and microstructures can scatter SP modes, and the free light coupled through the two surfaces will produce a phase difference, resulting in a weakening of the coupled light intensity; secondly, periodic nanostructure scattering will change the original spectral shape of the device ; Finally, this method of introducing nanostructures is more complicated, and it is easy to affect the electrical properties of the device
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[0019] The present invention will be further described in detail through the embodiments below in conjunction with the accompanying drawings.
[0020] In this example, a nanostructure formed by the self-agglomeration effect of a small molecular aromatic compound is introduced into an organic light-emitting OLED, and its enhancement effect on the light emitted from the top of the device is studied. Wherein, the material selected for the hole transport layer is NPB, that is, N, N'-bis-(3-naphthyl)-N, N'-diphenyl-[1,1'-diphenyl]-4,4 '-Diamine (N, N'-diphenyl-N, N'-bis(1,1'-biphenyl)-4,4'-diamine), its structure is as follows:
[0021]
[0022] The material selected for the light-emitting layer and the electron transport layer is 8-hydroxyquinoline aluminum (Alq3, tris(8-hydroxy)-quinoline-aluminium,), and its structure is as follows:
[0023]
[0024] The small molecular aromatic compound is BCP (bathocuproine), whose structure is as follows:
[0025]
[0026] 1. The p...
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Abstract
This invention discloses a method for enhancing top light extraction efficiency of organic electroluminescence device, and relative apparatus thereof; wherein the method comprises steps of: setting mono-layer or multilayer metal as top extraction electrode in organic electroluminescence device of flat layered structure; evaporating or coating micro-molecule aromatic compound which is in solid state at room temperature onto the top extraction electrode in vacuum manner; forming a layer of membrane having nano-micro structure directly via self-clustering effect of the micro-molecule aromatic compound, thereby scattering surface plasmon wave restricted on interface of metal top extraction electrode into free optical field so as to achieve enhancement of top light extraction. This invention introduces nano-micro structure easily to flat organic electroluminescence device without influencing original electronic performance of device; furthermore, this invention enhances top light extraction of device without changing original luminescent spectrum thereof, thereby realizing great utility value.
Description
technical field [0001] The invention belongs to the field of organic electroluminescent devices (OLEDs), and in particular relates to a method for improving the top emission light efficiency of organic electroluminescent devices and a corresponding device. Background technique [0002] OLED display is currently recognized as a promising flat-panel display technology in the world, especially the top-emitting OLED is suitable for high-resolution active matrix display. They often adopt a planar sandwich structure, in which due to the existence of the interface, part of the exciton deactivation luminescence energy will be bound in the surface plasmon wave (SP) mode (that is, the density oscillation of surface free electrons confined to the metal interface) at the metal-electrode interface. The SP wave vector is larger than that of the free light mode, so if there is no nano-micro optical structure to scatter it out, the SP mode will eventually be dissipated in the form of Joule...
Claims
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Login to View More IPC IPC(8): H01L51/56H01L51/50H01L51/52H01L51/54
Inventor陈志坚王紫瑶肖立新龚旗煌
OwnerPEKING UNIV