TW595256B - Polymer electro-luminescent device with improved readability under strong light and manufacturing method thereof - Google Patents
Polymer electro-luminescent device with improved readability under strong light and manufacturing method thereof Download PDFInfo
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595256 五、發明說明(1) 【發明所屬之技術領域】 本發明係有關一種改善強光下可讀性之高分子電激發 光元件及製造方法,尤指一種藉由透明陰極技術與陰極上 網版印刷上一層吸光層以吸收光線之高分子電激發光元件 〇 【先前技術】 已知,有機電激發光元件的技術,依其使用有機薄膜 材料的不同,可將其區分為兩類,其中以共軛性高分子材 料之高分子元件(p〇lymer —base(i device )系統,稱為 PLED (Polymer Light Emitting Diode),另一種以染料 及顏料為材料的小分子元件(Μ 〇 1 e c u 1 e - b a s e d d e v i c e ) 系統’稱為OLED (Organic Light EmittingDi ode)。 所谓共概高分子,其主鏈為一相間未飽和的兀電子共 輛長鍵所組成,在這些高分子中内的π電子雲共軛體系間 的鍵結和反鍵結的能帶差大約為丨· 5〜2· 〇eV,其與無機半 導體中價帶和傳導帶的能量相近。若將共軛高分子溶解於 適當的有機溶劑中,可使用旋轉塗糢法(spin — c〇ating) 將共輛高分子溶液塗蓋在清洗過的玻璃基板上,一片均勻 分布在玻璃基板上的共軛高分子薄膜,可藉由此法輕易的 達成’而這種可運用溶夜加工的製程,正是PLED相當重要 =特性,相較於0LED中需使用真空熱蒸鍍的方法,蒸鍍電 荷傳導層和發光層的材料,此法簡易甚多。且pLED可製作 於軟性基板上,且輕薄短小與廣視角並具有大量生產快速 之潛力的優點而被視為繼0LED之後深具潛力的顯示器。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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仓屬:其:電發光元件在應用上,由於其陰極為 2 :其.'不面板在戶外等較亮環境下會有陰極反光干 擾的n-般解決的方法是利用不反光的陰㈣iack cathode)或是吸收光線之塗佈層(buck iayer)亦或是 在兀件上層加入四分之波長檢光板解決,,然而,上述之解 決方法不僅結構較不易製作,其材料的研發更是不易,而 習知使用上述方法所得之效果亦有待改善。 【發明内容】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]
、爰疋,本發明之主要目的,在於解決上述傳統之缺失 ’避免缺失存纟,本發明藉由網版印刷技術,纟陰極印刷 上一層吸光層,並搭配透明陰極,以大幅減少顯示面板陰 極反光之干擾,增加對比度。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.
為達上述之目的,本發明之改善強光下可讀性之高分 子電激發光元件及其製造方法,係由一基板、一陽極、一 電洞傳輸層、一有機發光層、一透明金屬陰極、一透明導 電層及一吸光層所組成,當外部光線自基板入射後,因該 金屬陰極及導電層係為透明材質,使光線得以不被反射, 而直接穿透至該吸光層,俾藉由該吸光層吸收入射光線, 以減少反光情形,而增加對比度。 【實施方式】 兹有關本發明之詳細内容及技術說明,現配合圖式說 明如下: 請參閱「第1圖所示」,係本發明之結構示意圖。如 圖所示:本發明之改善強光下可讀性之高分子電激發光元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 五、發明說明(3) 件,係由一基板1 1 、一陽極1 2、一電洞傳輸層1 3、 一有機發光層1 4、一透明金屬陰極1 5 、一透明導電層 16及一吸光層17所組成。 上述之基板1 1 ,係可為玻璃基板或透明塑膠基板; 該陽極1 2 (Anode ),係為ITO透明導電膜,以濺鍍或蒸 鍍方式,附著於該基板1 1上; 該電洞傳輸層 1 3 (Hole Transport Layer,HTL) ,係塗佈於該陽極1 2上,用以增加電激發光元件之發光 效率; 該有機發光層1 4 ( E m i 11 i n g L a y e r ),係塗佈於該 電洞傳輸層1 3上,係為一種共軛高分子聚合物; 該透明金屬陰極1 5,係蒸鍍於該有機發光層1 4上 ,可含有鎂(Mg)、鋁(A1)、鋰(Li)等金屬; 該透明導電層1 6,係濺鍍於該透明金屬陰極1 5上 ,藉以保護該透明金屬陰極1 5不致於網版印刷吸光層^ 7時受損; 該吸光層1 7,係藉由網板印刷技術設於該導電層^ 6上;其中該吸光層可為一深色電木材料、一摻混深色染 料之高分子材料(例如壓克力樹醋、環氧樹S旨、石夕膠| 酯); / 其中該深色材料係具有下列結構 (l)aromatic derivative (芳香族化合物):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):
第7頁 595256Page 7 595256
、發明說明(4) OH 五Description of the invention (4) OH five
rsc3 (JD^i ( X) M = M ( l , \=Jrsc3 (JD ^ i (X) M = M (l, \ = J
S ; \=JS; \ = J
n=n n'· 丫 ·ί, R30,’S03R OCCQ ) (2)aromatic derivative 2 (芳香族化合物):n = n n '· ya · ί, R30, ’S03R OCCQ) (2) aromatic derivative 2 (aromatic compound):
NH今 {rscv^^ SOjR (以上兩組化合物R =烧基取代基) 當外部光線自基板1 1入射後,因該金屬陰極1 5及 導電層1 6係為透明材質,使光線得以不被反射,而直接 穿透至該吸光層,俾藉由該吸光層吸收入射光線,以減少 反光情形,而增加對比度。 請參閱「第2圖所示」,係本發明之製造方法流程圖 。如圖所示:為達上述之改善強光下可讀性之高分子電激 發光元件,本發明之製造方法,係包含下列步驟: a )、基板清洗並圖案化2 1 ,係將基板予以清洗並 以濺鍍或蒸鍍方式,鍍上一層陽極予以圖案化;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 )、塗佈電洞傳輸層2 2,係於該陽 電洞傳輪層; c )、塗佈有機發光層2 3 ,係於該電 # —層有機發光層; _ d )、蒸鍍透明金屬陰極2 4,係再於 上蒸鍍透明金屬陰極; 、 e )、濺鍍透明導電層2 5 ,係於該透 濺鍍透明導電層。 f )、網版印刷吸光層2 6,係於該透 版印刷上一層吸光層,如是構成本發明之改 性之高分子電激發光元件。 上述僅為本發明之較佳實施例而已,並 發明實施之範圍。即凡依本發明申請專利範 變化與修飾’皆為本發明專利範圍所涵11 上塗佈一層 傳輸層上塗 有機發光層 金屬陰極上 導電層上網 強光下可讀 用來限定本 所做的均等 595256 圖式簡單說明 【圖式簡單說明】 第1圖,係本發明之結構示意圖。 第2圖,係本發明之製造方法流程圖。 【圖式之標號說明】 基板.....................11 陽極.....................12 電洞傳輸層..................13 有機發光層..................14 透明金屬陰極.................15 透明導電層..................16 吸光層....................17 基板清洗並圖案化...............21 塗佈電洞傳輸層................22 塗佈有機發光層· · · · .............23 蒸鍍透明金屬陰極...............S 4 濺鍍透明導電層................25 網版印刷吸光層.............. · · 2 6b), 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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