TW595256B - Polymer electro-luminescent device with improved readability under strong light and manufacturing method thereof - Google Patents

Abstract

This invention provides a polymer electro-luminescent device with improved readability under strong light and a manufacturing method thereof, which comprises a substrate, an anode, a hole transport layer, an organic luminescent layer, a transparent metal cathode, a transparent conduction layer and a light absorption layer. When an external light is incident from the substrate, as the metal cathode and the conductive layer are transparent materials, the light is not reflected but directly transmits to the light absorption layer. Therefore, the light absorption layer can absorb the incident light to reduce the reflection and thus the degree of contrast can be increased.

Description

595256 V. Description of the invention (1) [Technical field to which the invention belongs] The present invention relates to a polymer electric light-excitation light element and a manufacturing method for improving readability under strong light, in particular, a transparent cathode technology and a cathode screen A polymer electric excitation light element with a light absorbing layer printed on it to absorb light. [Prior art] It is known that the technology of organic electric excitation light element can be divided into two types according to the different organic thin film materials. Polymer-base (i device) system of conjugated polymer materials, called PLED (Polymer Light Emitting Diode), another small-molecule device based on dyes and pigments (Μ 〇 1 ecu 1 The e-based device) system is called OLED (Organic Light Emitting Diode). The so-called co-profiling polymer, the main chain of which is composed of a phase-unsaturated Wu electron and a long bond, the π electron cloud in these polymers The energy band difference between the bond and anti-bond between the conjugated systems is about 丨 · 5 ~ 2 · 〇eV, which is similar to the energy of the valence and conduction bands in inorganic semiconductors. The polymer is dissolved in an appropriate organic solvent. A spin-coating method can be used to coat a total polymer solution on the cleaned glass substrate, and a piece of the conjugate height is evenly distributed on the glass substrate. The molecular thin film can be easily achieved by this method. And this process that can be processed by solvent processing is very important for PLED = characteristics. Compared with 0LED, vacuum thermal evaporation method is used to vaporize the charge conductive layer. This method is much simpler, and the material of the light-emitting layer. And pLED can be made on a flexible substrate, and has the advantages of light, thin, short, wide viewing angle, and the potential for rapid mass production. It is regarded as a promising display after 0LED.

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Warehouse belongs to: its: in the application of electroluminescent elements, because its cathode is 2: its. 'No panel will have negative reflection interference of the cathode in bright environments such as outdoors. The n-like solution is to use a non-reflective iack cathode. ) Either a coating layer (buck iayer) that absorbs light or a quarter-wavelength photometric plate is added to the upper part of the element. However, the above solution is not only difficult to manufacture, but also difficult to develop materials. And the effect obtained by using the above method is still to be improved. [Summary of the Invention]

The main purpose of the present invention is to solve the above-mentioned traditional lack of 'avoiding the lack of storage.' The present invention uses screen printing technology to print a light-absorbing layer on the cathode and match it with a transparent cathode to greatly reduce the cathode of the display panel. Interference from reflections increases contrast.

In order to achieve the above-mentioned object, the high-molecular electrical excitation light element and its manufacturing method for improving readability under strong light of the present invention are composed of a substrate, an anode, a hole transport layer, an organic light-emitting layer, and a transparent metal. The cathode, a transparent conductive layer, and a light absorbing layer are composed. When external light is incident from the substrate, the metal cathode and the conductive layer are transparent materials, so that the light cannot be reflected and directly penetrates the light absorbing layer. The light absorbing layer absorbs incident light to reduce reflections and increase contrast. [Embodiment] The detailed content and technical description of the present invention are described below with reference to the drawings: Please refer to "shown in Fig. 1", which is a structural diagram of the present invention. As shown in the figure: the polymer electro-excitation optical element of the present invention improves readability under strong light

595256 V. Description of the invention (3), which consists of a substrate 1 1, an anode 1 2, a hole transport layer 1 3, an organic light emitting layer 1 4, a transparent metal cathode 15, a transparent conductive layer 16 and It consists of a light absorbing layer 17. The above-mentioned substrate 1 1 may be a glass substrate or a transparent plastic substrate; the anode 1 2 (Anode) is an ITO transparent conductive film, and is attached to the substrate 11 by sputtering or evaporation; the hole The transport layer 1 3 (HTL) is coated on the anode 12 to increase the luminous efficiency of the electro-excitation light element. The organic light-emitting layer 1 4 (E mi 11 ing Layer) is a coating Disposed on the hole transport layer 13 is a conjugated polymer; the transparent metal cathode 15 is vapor-deposited on the organic light-emitting layer 14 and may contain magnesium (Mg), aluminum (A1 ), Lithium (Li) and other metals; the transparent conductive layer 16 is sputtered on the transparent metal cathode 15 to protect the transparent metal cathode 15 from being damaged when screen-printed light-absorbing layer ^ 7; The light absorbing layer 17 is provided on the conductive layer ^ 6 by screen printing technology; wherein the light absorbing layer may be a dark bakelite material, a polymer material mixed with a dark dye (such as acrylic tree) Vinegar, epoxy tree S purpose, stone gum | ester); / where the dark material has the following structure (l) aromatic deriv ative (aromatic compound):

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Description of the invention (4) OH five

rsc3 (JD ^ i (X) M = M (l, \ = J

S; \ = J

n = n n '· ya · ί, R30, ’S03R OCCQ) (2) aromatic derivative 2 (aromatic compound):

NHpresent {rscv ^^ SOjR (the above two groups of compounds R = thiol substituents) When external light is incident from the substrate 11, the metal cathode 15 and the conductive layer 16 are transparent materials, so that the light can not be blocked. It reflects and directly penetrates into the light absorbing layer, and the incident light is absorbed by the light absorbing layer to reduce the reflection and increase the contrast. Please refer to "shown in Fig. 2", which is a flowchart of the manufacturing method of the present invention. As shown in the figure: in order to achieve the above-mentioned high-molecular electro-optical excitation element with improved readability under strong light, the manufacturing method of the present invention includes the following steps: a), substrate cleaning and patterning 2 1, the substrate is subjected to Clean and sputter or evaporate, plate a layer of anode and pattern it;

b), coating the hole transport layer 22, which is connected to the anode hole transfer layer; c), coating the organic light-emitting layer 2 3, which is connected to the electrical # -layer organic light-emitting layer; _d), vapor-deposited transparent The metal cathode 24 is a transparent metal cathode vapor-deposited thereon; e), and the transparent conductive layer 25 is sputtered on the transparent conductive layer. f) Screen-printing light-absorbing layer 26 is a light-absorbing layer on the through-printing. If it is a modified polymer electro-optical light-emitting element of the present invention. The above are only the preferred embodiments of the present invention, and the scope of the invention's implementation. That is, all the changes and modifications of the patent application according to the present invention are within the scope of the patent of the present invention. 11 A coating of a transmission layer, an organic light-emitting layer, a metal cathode, and a conductive layer of the cathode are readable under strong light. 595256 Schematic description [Schematic description] Figure 1 is a schematic diagram of the structure of the present invention. Fig. 2 is a flowchart of a manufacturing method of the present invention. [Explanation of Symbols in Drawings] Substrate .............. 11 Anode ... .. 12 Hole Transmission Layer .. 13 Organic Light Emitting Layer .. 14 Transparent Metal Cathode ... 15 Transparent conductive layer ... 16 Light absorbing layer ... ............. 17 Substrate cleaning and patterning ......... 21 Coated hole transport layer ......... ....... 22 Coated organic light-emitting layer .............. 23 Evaporated transparent metal cathode .............. .S 4 Sputtered transparent conductive layer ...... 25 Screen printing light-absorbing layer .............. 2 6

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Claims (1)

6. Scope of patent application 1. A polymer electro-optical light-emitting element for improving readability under strong light, including: a substrate; an anode, patterned and attached to the above substrate by sputtering or evaporation, A hole transporting layer is coated on the anode; an organic light emitting layer is coated on the hole transporting layer; a transparent metal cathode is evaporated on the organic light emitting layer; A transparent conductive layer is sputter-plated on the metal cathode; a light absorbing layer is screen-printed on the conductive layer; wherein, when external light is incident from the substrate, the transparent metal cathode and the transparent conductive layer The layer is a transparent material, so that light is not reflected, but directly penetrates to the light absorbing layer. The light absorbing layer absorbs incident light to reduce reflections and increase contrast. / 2. The high-molecular electrical excitation light element for improving readability under strong light as described in item 1 of the scope of patent application, wherein the substrate may be a transparent glass substrate. 3. The high-molecular electrical excitation light element for improving readability under strong light as described in item 1 of the scope of patent application, wherein the substrate may be a transparent plastic substrate. 4. The high-molecular electrical excitation light element for improving readability under strong light as described in item 1 of the scope of patent application, wherein the anode is a transparent conductive film. 5. The high-molecular electro-optical excitation light element for improving readability under strong light as described in item 1 of the scope of patent application, wherein the transparent metal cathode contains metals such as magnesium, Shao, and lithium. 6, Improve the readability under strong light as described in item 1 of the scope of patent application 595256 Scope of patent application Knife electro-excitation light element, wherein the organic light-emitting layer is a conjugated high-knife polymer. 7. The high-knife electro-excitation light element for improving readability under strong light as described in item 1 of the scope of patent application, wherein the light absorbing layer is a dark bakelite material 8. As described in item 1 of the scope of patent application The high-molecular electro-excitation light-emitting device for improving readability under strong light, wherein the light-absorbing layer is a high-molecular material mixed with a dark dye. 9. The high-molecular electro-excitation light element for improving readability under strong light as described in item 1 of the scope of patent application, wherein the dark material of the light-absorbing layer is an aromatic compound. 10. A method for manufacturing a high-molecular electro-optical light-emitting device for improving readability under strong light, including the following steps: a) cleaning and patterning a substrate, first cleaning the substrate and then sputtering or vaporizing the substrate, A layer is plated with an anode to be patterned; b) a hole transporting layer is coated, and a hole transporting layer is coated on the anode; c) an organic light emitting layer is coated, and then the hole transporting layer is coated Lay an organic light-emitting layer; d) a transparent metal cathode is vapor-deposited on the organic light-emitting layer; a transparent metal cathode is vapor-deposited on the organic light-emitting layer; e) a transparent conductive layer is sputtered and a transparent conductive layer is sputtered on the transparent metal cathode. f), screen printing light absorbing layer, which is based on the transparent conductive layer screen printing Page 12 595256 6. Scope of patent application Brushing a light absorbing layer, if it constitutes the high molecular electric exciting light element of the present invention to improve the readability under strong light. Page 13