A kind of Organic Light Emitting Diode of sandwich constructionTechnical field
The present invention relates to a kind of Organic Light Emitting Diode of sandwich construction.
Background technology
Organic Light Emitting Diode is also called Organic Electricity laser display, has self luminous characteristic, adopts very thin coating of organic material and glass substrate, when there being electric current to pass through, these organic materials will be luminous, and OLED display screen curtain visible angle is large, and can save electric energy.Common are three-decker and sandwich construction, wherein, sandwich construction is on the basis of three-decker, adds electron injecting layer and hole injection layer, but the charge injection efficiency comparison of hole injection layer is low, and driving voltage is higher.
Summary of the invention
For the problems referred to above, the invention provides a kind of Organic Light Emitting Diode of sandwich construction, existing sandwich construction is improved, improve the charge injection efficiency of hole injection layer, reduce driving voltage.
For realizing above-mentioned technical purpose, reach above-mentioned technique effect, the present invention is achieved through the following technical solutions:
A kind of Organic Light Emitting Diode of sandwich construction, comprise the cathode layer, electron injecting layer, electron transfer layer, luminescent layer, hole transmission layer, hole injection layer, anode layer and the glass substrate that stack in turn from top to bottom, it is characterized in that, described cathode layer is MgAg alloy-layer, described anode layer is conductive glass layer, also be provided with resilient coating between described hole injection layer and conductive glass layer, described resilient coating is insulating material layer and thickness is 0.6-1.8nm, and described hole injection layer is PEDOT layer.
Preferably, described resilient coating can be silicon dioxide layer, or layer of lithium fluoride.
Preferably, electron injecting layer is alkali compound layer or alkali metal fluoride layer.
Hole injection layer adds the charge injection between interface, can improve efficiency and the life-span of device, adopts PEDOT Rotating fields can surface flattening by resilient coating, reduces the probability of shorted devices, reduces the starting voltage of device; Resilient coating improves charge injection efficiency, the reduction driving voltage of hole injection layer; Electron injecting layer help electronics or hole more effective from electrode injection electron transfer layer.
The invention has the beneficial effects as follows: existing sandwich construction is improved, improve the charge injection efficiency of hole injection layer, reduce driving voltage.
Accompanying drawing explanation
Fig. 1 is the structural representation of the Organic Light Emitting Diode of a kind of sandwich construction of the present invention;
The mark implication of accompanying drawing is as follows:
1:MgAg alloy-layer; 2: electron injecting layer; 3: electron transfer layer; 4: luminescent layer; 5: hole transmission layer; 6: hole injection layer; 7: resilient coating; 8: conductive glass layer; 9: glass substrate.
Embodiment
Below in conjunction with accompanying drawing and specific embodiment, technical solution of the present invention is described in further detail, can better understand the present invention to make those skilled in the art and can be implemented, but illustrated embodiment is not as a limitation of the invention.
An Organic Light Emitting Diode for sandwich construction, as shown in Figure 1, comprises the cathode layer, electron injecting layer 2, electron transfer layer 3, luminescent layer 4, hole transmission layer 5, hole injection layer 6, anode layer and the glass substrate 9 that stack in turn from top to bottom.Wherein, described cathode layer is MgAg alloy-layer 1, described anode layer is that conductive glass layer 8(utilizes the multiple methods such as sputtering, evaporation to plate indium oxide layer tin, be commonly called as ITO), resilient coating 7 is also provided with between described hole injection layer 6 and conductive glass layer 8, described resilient coating 7 is insulating material layer and thickness is 0.6-1.8nm, and described hole injection layer 6 is PEDOT layers.Preferably, the thickness of top bottom glass substrate 9 of described cathode layer is 1-2mm, and namely the altitude range of device is 1-2mm.
Wherein, described resilient coating 7 can be silicon dioxide layer, also can be layer of lithium fluoride.The thickness of resilient coating 7 is unsuitable excessive, otherwise driving voltage can be caused to rise on the contrary.
Wherein, described electron injecting layer 2 can be alkali compound layer, and thickness is 0.5-0.8mm, such as, and lithia, cesium carbonate etc.; Also can be alkali metal fluoride layer, and thickness be 0.3-0.8mm, such as sodium fluoride, potassium fluoride etc.
Hole injection layer 6 adds the charge injection between interface, can improve efficiency and the life-span of device, adopts PEDOT Rotating fields can surface flattening by resilient coating 7, reduces the probability of shorted devices, reduces the starting voltage of device; Resilient coating 7 improves charge injection efficiency, the reduction driving voltage of hole injection layer 6; Electron injecting layer 2 help electronics or hole more effective from electrode injection electron transfer layer 3.
These are only the preferred embodiments of the present invention; not thereby the scope of the claims of the present invention is limited; every utilize specification of the present invention and accompanying drawing content to do equivalent structure or equivalent flow process conversion; or be directly or indirectly used in the technical field that other are relevant, be all in like manner included in scope of patent protection of the present invention.