CN107994135A

CN107994135A - A kind of processing method that film is extracted outside OLED luminescent devices

Info

Publication number: CN107994135A
Application number: CN201711286606.6A
Authority: CN
Inventors: 金凌; 江创; 刘纪文
Original assignee: Wuhan Huamei Chenxi Photoelectric Co Ltd
Current assignee: Wuhan Huamei Chenxi Photoelectric Co Ltd
Priority date: 2017-12-07
Filing date: 2017-12-07
Publication date: 2018-05-04

Abstract

Invention is related to Organic Light Emitting Diode (OLED) lighting technical field, there is provided the processing method that film is extracted outside a kind of OLED luminescent devices, first fixes metal mesh on substrate, then one layer of resin of blade coating, metal mesh is then taken out, and substrate is reversely inverted, dries shaping.By the flow, the present invention can obtain one layer of film with array of structures.The film is used for the light emission side of OLED illuminating devices, can significantly improve the light extraction efficiency of device.Compared with prior art, operating process of the invention is simple, be easily achieved, cost is low.

Description

A kind of processing method that film is extracted outside OLED luminescent devices

Technical field

The present invention relates to Organic Light Emitting Diode (OLED) lighting technical field, more particularly to a kind of OLED luminescent devices The processing method of outer extraction film.

Background technology

Recently, Organic Light Emitting Diode (Organic Light Emitting Diodes, OLED) cause scientific research circle and The extensive concern of industrial circle.As a kind of area source, OLED has flexible, environmental protection, frivolous, low temperature, low-power consumption and eyeshield The advantages that.In other words, the application prospect of OLED illuminations is huge, it is expected to as the mainstream of future illumination.

The internal quantum efficiency of traditional OLED device can be close to 100%, but external quantum efficiency only has 20%, this is undoubtedly Largely limit the practical application of OLED.At present, micro structure array structure is as a kind of important lifting OLED Device external quantum efficiency method and receive scientific research circle and widely pay close attention to.By adjusting material category, shape, focal length and duty cycle Etc. parameter, which can not only change the refractive index for optical interface, while can also change the angle of light extraction, so as to reduce The probability that interface is totally reflected, greatly promotes the overall external quantum efficiency of device.At present, this micro structure array is mainly three Optical grating construction and three-dimensional hemispherical lens structure are tieed up, its preparation method mainly includes three-dimensional laser direct write, gray scale etching, ion beam Etching, nano impression, Photoresist reflow method etc., have related separately to optics, machinery, chemistry, material, semiconductor and micro-nano technology Etc. multiple scientific domains.The most manufacturing cost of these preparation methods is higher and the time is longer.

The content of the invention

The technical problems to be solved by the invention are to provide the processing method that film is extracted outside a kind of OLED luminescent devices, with gram Take the deficiencies in the prior art.

In order to solve the above technical problems, the present invention provides the processing method that film is extracted outside a kind of OLED luminescent devices, including Step：

Metal mesh is fixed on ITO substrate backs, then ITO substrates are fixed on the sample stage of doctor knife coater；

One layer of resin is scratched on substrate back surface, the thickness covering metal mesh of the resin, forms one layer organic thin Film；

Metal mesh is separated with substrate, and substrate back is placed to dry downwards, until resin is fully cured.

In dry process, due to the gravity of resin itself, so as to obtain the light extraction film with surface three dimension micro-structure. When incident light beam strikes are to the film surface, since refractive index and the substrate of organic solvent are almost consistent, so in substrate/extraction Membrane interface will not be totally reflected substantially.At extraction film/Air Interface, in the effect of extraction film surface three-dimensional matrix structure Under, the incidence angle of light is changed, and on the one hand reduces the total reflection of interface, on the other hand can also regulate and control the outgoing of light Angular.In short, under the action of both phenomenons, which reduces the substrate mode during device light extraction, from And improve the external quantum efficiency of OLED device.

Preferably, the resin is polymethyl methacrylate, epoxy resin, polyimides, polyurethane, methacrylic acid Secondary butyl ester, two ring pentyl ester of methacrylic acid or cyclohexyl acrylate.

Preferably, the resin has and the matched refractive index of substrate.

Choosingization, the resin stand at normal temperatures 4-6 it is small when, with obtain uniformly and bubble-free resin.

Choosingization, the substrate is cleaned by ultrasonic substrate before metal mesh is placed, to obtain clean substrate.

It is further preferred that the metal mesh is copper mesh.

Preferably, the substrate is glass, PET, TPU or double faced adhesive tape.

Beneficial effects of the present invention:In the present invention, doctor blade technique is combined with screen printing technique, with doctor blade technique with Screen printing is combined.Wherein, knife coating can prepare the film of a layer specific thickness on substrate, and with silk-screen printing knot After conjunction, it can make it that the film of blade coating there is specific shape.And realized by the self gravitation of material with surface three dimension The preparation of the extraction film of array structure, on the premise of emitting device structure is not influenced, reduce the substrate mode of device so as to Improve the external quantum efficiency of device.Compared with prior art, operating process of the invention is simple, be easily achieved, cost is low.

Brief description of the drawings

Technical scheme is further described in detail with reference to the accompanying drawings and detailed description.

Fig. 1 is OLED illuminating devices schematic diagram of the present invention.

Fig. 2 is the front view of OLED illuminating devices of the present invention.

Fig. 3 is array film light extraction schematic diagram in the present invention.

Fig. 4 is specific preparation process schematic diagram in the present invention,

Wherein, Fig. 4 (a) is tpo substrate, and Fig. 4 (b) is the schematic diagram fixed on substrate after metal mesh, and Fig. 4 (c) is blade coating tree Schematic diagram after fat, Fig. 4 (d) are to scrape the inverted schematic diagram of back substrate of resinizing, and Fig. 4 (e) is that substrate inversion resin dries curing Schematic diagram afterwards, Fig. 4 (f) are the substrate schematic diagrames with extraction film.

Label is respectively

100：Array film； 101:Glass；

102:ITO； 103:Organic luminous layer；

104：Metallic cathode； 201：OLED illuminating devices

Embodiment

Present embodiment includes ito glass plate substrate, the compound light extraction film in the back side of glass plate, containing saturating in light extraction film Lens array micro-structure.Medium is copper mesh used by the present embodiment screen printing.Select copper mesh the reason on the one hand be due to Copper mesh it is cheap, be on the other hand due to that the processing of copper mesh is already ripe on the market at present and model is varied, string diameter Scope is from 0.1-300mm, and pore diameter range is from 10-400 mesh etc.., can accounting for control structure by selecting the copper mesh of different model The empty when parameter such as radius size.It is 100 mesh that the present embodiment, which selects the size of copper mesh, and thickness is about 500um, used instrument Mainly based on doctor knife coater.Certainly, except glass, substrate can also be PET, TPU or double faced adhesive tape.

As shown in figure 4, extracting the processing method of film outside OLED luminescent devices, comprise the following steps：

Step 1, the resin for measuring 10g, and 4-6h is stood at normal temperatures, obtain uniform and bubble-free organic solution.Tree Fat has very high moulding, while after film forming, there is the performance of self-healing, has good machinery and self-protection performance.This Embodiment preferred resin is polymethyl methacrylate, epoxy resin, polyimides, polyurethane, the secondary butyl ester of methacrylic acid, first Base dicyclopentanyl acrylate or cyclohexyl acrylate, and have and the matched refractive index n of glass substrate, i.e. n ≈ 1.5.

Step 2, be cleaned by ultrasonic glass substrate, and by sample UV-0zone more than half an hour, has obtained clean Substrate, as shown in Fig. 4 (a).

Shown in step 3, such as Fig. 4 (b), copper mesh is fixed on the ito glass substrate back that thickness is 1mm with adhesive tape, and with Ito glass is fixed on the sample stage of doctor knife coater with adhesive tape afterwards.The size of copper mesh and ito glass is selected according to demand Select.

The smearing thickness of doctor knife coater, is arranged to 1.8mm by step 4, removes the thickness of glass in itself, substrate institute after blade coating The thickness of the film of formation is 800um.

Step 5, be coated with suitable organic solvent on doctor knife coater, and starts to scratch.In order to obtain during blade coating The uniform film of sample surfaces, the organic solvent being coated with here are preferably excessive.

Step 6, through blade coating sample surfaces form the organic film that a layer thickness is about 800um, as shown in Fig. 4 (c). Then, copper mesh and glass are basically separated, and glass substrate is reversely inverted, as shown in Fig. 4 (d).According to selected organic The species of solvent is different, and it is different to be inverted the cured time.Resin is a kind of jelly before curing, and with very strong viscosity. After blade coating and inversion, which can be subject to a downward active force, thus after hardening formed one have arc and The three-dimensional structure of surface bulge, as shown in Fig. 4 (e).Substrate compound collecting film such as Fig. 4 (f) institutes that solution is just being put after being fully cured Show.

As shown in Figure 1, Figure 2, Figure 3 shows, compound organic thin film layer 100, You Jifa on the substrate back of OLED illuminating devices 201 Both direction is propagated up and down for the light that photosphere 103 is sent point, wherein the light upwardly propagated by metallic cathode 104 reflect and finally down Propagate.Reflected light and the downward light of light source pass through organic luminous layer 103 respectively, ITO layer 102, and substrate glassy layer 101 is straight To organic thin film layer 100.Since the organic thin film layer 100 containing micro-structure can effectively avoid being all-trans for substrate/Air Interface Penetrate, it is possible to which effective extraction is incident to the light in substrate glass, so as to lift the overall coupling efficiency of device.In this example Organic film is the outer light extraction film of OLED device, test result indicates that the extraction efficiency is up to 47%.

It should be noted last that above embodiment is merely illustrative of the technical solution of the present invention and unrestricted, Although the present invention is described in detail with reference to preferred embodiment, it will be understood by those of ordinary skill in the art that, can be right Technical scheme technical scheme is modified or replaced equivalently, without departing from the spirit and scope of technical solution of the present invention, its is equal It should cover among scope of the presently claimed invention.

Claims

1. the processing method of film is extracted outside a kind of OLED luminescent devices, it is characterised in that including step：

One layer of resin, the thickness covering metal mesh of the resin are scratched on substrate back surface；

Metal mesh is separated into taking-up with substrate, and substrate back is placed to dry downwards, until resin is fully cured.

2. the processing method of film is extracted outside OLED luminescent devices according to claim 1, it is characterised in that the resin is The secondary butyl ester of polymethyl methacrylate, epoxy resin, polyimides, polyurethane, methacrylic acid, two ring pentyl ester of methacrylic acid Or cyclohexyl acrylate.

3. the processing method of film is extracted outside OLED luminescent devices according to claim 2, it is characterised in that the resinous wood Material has and the matched refractive index of substrate.

4. the processing method of film is extracted outside OLED luminescent devices according to claim 3, it is characterised in that the resin exists When standing 4-6 is small under room temperature, to obtain the resin of uniform and bubble-free.

5. the processing method of film is extracted outside OLED luminescent devices according to claim 1, it is characterised in that the substrate exists Before placing metal mesh, substrate is cleaned by ultrasonic, to obtain clean substrate.

6. the processing method of film is extracted outside the OLED luminescent devices according to one of claim 1 to 5, it is characterised in that institute Substrate is stated as glass, PET, TPU or double faced adhesive tape.

7. the processing method of film is extracted outside OLED luminescent devices according to claim 1, it is characterised in that the metal mesh For copper mesh.