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Charge injection layer for electro-optical devices

A technology of charge injection layer and electro-optic device, which is applied in the direction of electric solid device, electrical component, semiconductor device, etc., can solve the problem of insolubility, and achieve the effect of low reactivity and efficient energy

Inactive Publication Date: 2009-06-10
UNIV DE VALENCIA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This insolubility in solvents is of course problematic when considering the techniques used to prepare polymer layers typically having a thickness of about 100 nm by processes from non-aqueous solutions

Method used

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  • Charge injection layer for electro-optical devices
  • Charge injection layer for electro-optical devices
  • Charge injection layer for electro-optical devices

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Embodiment Construction

[0023] As far as the inventors are aware, there is only one additional example of OLEDs in the prior art where inorganic salts are added to the molecular material for improved charge injection. This appears in International Publication WO2006011090 for application to solid state LEEC cells (Light Emitting Electrochemical Cells). image 3 A depiction of LEEC is shown, where ions are represented by positive and negative circles, while luminescent molecules are depicted as curved lines. The huge difference between this type of device (LEEC) and the device of the present invention can be compared image 3 and figure 2 See, namely: in LEEC ( image 3 ), the charges are distributed throughout the luminescent material, and in the device of the present invention ( figure 2 ), the ions are found only in the charge injection layer between the anode (ITO) and the emissive layer. This leads to extremely long activation times of the devices in LEEC, varying from seconds to hours depe...

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Abstract

The present invention relates to charge injection from metallic conductors to semiconductor or insulation materials based on organic or inorganic molecules and macromolecules with electrical or optical properties, and specifically to a new charge injection layer for electro-optical devices comprising a polymer with conjugated units and a salt mixed with the aforementioned polymer, characterized in that the oxidation state of the polymer is not modified when it is mixed with the salt. Despite the fact that there is no change in the oxidation state of the polymer, the polymer and salt mixture according to the invention makes it possible for a high enough number of charges to reach the optically active layer, such that the efficiency in the charge injection process is increased up to levels exceeding even those provided by the standard PEDOT.

Description

technical field [0001] The invention relates to the injection of charge from metallic conductors into semiconductor or insulating materials based on organic or inorganic molecules and macromolecules with electrical or optical properties, and in particular to novel charge injection for electro-optic devices An injection layer comprising a polymer having conjugated units and a salt mixed with the aforementioned polymer, characterized in that the oxidation state of the polymer does not change when mixed with the salt. Background technique [0002] Molecular materials with light properties are currently used in several types of devices, such as in solar cells [1，2] and Light Emitting Diodes (OLEDs) [3，4] middle. Furthermore, molecular materials with electrical properties are also used in FET transistors (Field Effect Transistors). OLED devices (Organic Light Emitting Diodes) are commercially available because they show the possibility of low-cost production of flat-panel disp...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01L51/50H01L51/54
CPCH01L51/0035H01L51/5032H01L51/0038H01L51/5088H01L51/0036Y02E10/549H10K85/114H10K85/113H10K85/111H10K50/135H10K50/17
Inventor 亨德里克·扬·伯林克欧热尼奥·科罗纳多·米拉莱斯
Owner UNIV DE VALENCIA