TWI222842B - Device and method to increase the color saturation of polymer OLED - Google Patents

Abstract

A device and method to increase the color saturation of polymer OLED are disclosed, which is mainly to fabricate a cathode conductive substrate with patterned cathode layer, then dispose light-emitting material on the cathode conductive substrate. Fabricate the hole transport layer to control the overall thickness, anode layer sequentially. Next, dispose an interference film of semi-transparent film and passivation layer. The said semi-transparent interference layer and the cathode form a resonant interval, so that light wave can be resonant and interfere in this interval. The specific light wave is intensified and concentrated in this resonant interval, so as to obtain an emission panel with high intensity and single wavelength. At the same time, by adjusting the spacing between the semi-transparent interference layer, the required color light specifically can be obtained.

Description

1222842 __ 索 号 92109657 _ 年月 日 ___ V. Description of the invention (1) [Technical field to which the invention belongs] The present invention is a device and method for increasing the color saturation of a polymer organic light emitting diode element, which is applied to Full-color production in the display industry. [Previous technology] Because organic light emitting diodes (OLEDs) have self-light emitting, thin thickness, fast response speed, wide viewing angle, good resolution, high brightness, can be used for flexible panels and a wide temperature range Many advantages such as thin film liquid crystal display (TFT-LCD) are considered to be the new generation of flat display technology, and the light emitting principle of the organic light emitting diode (0LED) is to use materials The characteristics of the electron hole are combined on the light-emitting layer, and the energy generated raises the light-emitting molecule from the ground state to the excited state. When the electron drops from the excited state back to the ground state, its energy is released in the form of electromagnetic waves, thus achieving different wavelengths. Generation of light-emitting elements. The anode (Anode) is a conductive glass film of indium tin oxide (IT0), which is attached to a glass or transparent plastic substrate by sputtering or evaporation. The cathode contains magnesium (Mg), aluminum (Α1) ), Lithium (Li), calcium (Ca) and other metals 'are light emitting regions formed by multiple organic thin films between the two electrodes' including a hole injection layer (HIL) hole transport layer (Hole Transport Layer (HTL) organic emitting layer (Emitting layer) and electron transport layer (Electrori Transport

(Layer; ETL). In actual application for mass production, based on different needs and considerations, sometimes different films are included. Organic light-emitting diodes have the same materials as the organic light-emitting layer.

1222842

Light Emitting Diode; OLED) and isomeric organic light-emitting diodes (PlOymer Light Emitting Diode; PLED) based on conjugated polymers. In terms of material acquisition, both small molecule materials are synthesized and purified. Higher molecules are simple, and the requirements for mass production and purity of materials are easier to achieve. Relatively speaking, the material properties of small molecules are higher. The molecules are easier to grasp, but in terms of thermal stability and mechanical properties, polymers are better. For light-emitting elements, there are two important physical properties. One is the luminous energy efficiency and the other is the quantum efficiency. The luminous energy efficiency is defined as the electrical energy input into the element. The ratio of energy to light emission. The quantum efficiency of light emission is defined as the ratio of several photons that a hole can emit, in other words, the efficiency of electrical conversion into light. Polymer organic light emitting diode (PLED) element materials are not easy to control due to their molecular weight distribution. Generally speaking, smaller molecular organic light emitting diode (0LED) elements are inferior because of the impure light color. Polar body (PLED) elements are disadvantageous in full-color applications. [Summary of the invention] The main purpose of the present invention is to solve the above-mentioned shortcomings and avoid the existence of the missings. 'The present invention uses the physical characteristics of the resonant cavity to increase the external quantum efficiency of a specific wavelength under a given structure of a polymer electrically excited optical element. (External quantum efficiency), and at the same time improve the color saturation of the device, also use the optical interference principle to adjust the light color. There is also a problem of frequency doubling when the resonant cavity adjusts the main light color for interference. For example, 300, 600, and 900 nm will emit light. At this time, the interference light above it can be used to limit the main light color. At a wavelength, for example, only 600 nm of emitted light can be emitted.

1IM

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Case No. 92109657 V. Description of the invention (3) In the manufacturing process, the present invention adopts a general full-color polymer electrical excitation light surface, and an interference layer is formed by a deposition method. The interference layer is used for light mound selection, and is used to enhance light waves. 2. The two media are overlapped alternately on the transparent substrate-side: the lens, which forms a resonance interval between the cathode and the cathode. When the light wave resonates repeatedly within the interval: the light wave with a predetermined wavelength will be strengthened in this resonance cavity. And concentration, can obtain a high-intensity single-wavelength emission panel. The half-lens is made of Li Shao 帛 + material with the same fold rate as the deposition of the compound, so that the light wave can be a resonant cavity between the cathode and the half-lens Different light colors can be obtained by resonance, so full color = each light color can be adjusted and strengthened. [Embodiment] The detailed description and technical contents of the present invention are described below with reference to the drawings: Please refer to "shown in Figure 1", which is a schematic diagram of the device of the present invention. As shown in the figure, a cathode conductive substrate 1 is included. The cathode conductive substrate 10 has a patterned conductive substrate, and a partition wall between the cathodes is provided. A light-emitting layer 20 is located on the cathode conductive substrate 10, and the light-emitting layer 20 is made of polyethylene. A polymer organic light-emitting layer 20 of azole (PVK) -doped organic dye or polyfluorene is provided with a hole-transporting layer 30 on the light-emitting layer 20 and a hole-transporting layer 30. An anode layer 40 is provided on the anode layer 4G. A semi-transparent film interference layer 5 () is disposed on the anode layer. The translucent layer uses two kinds of substances with different refractive indexes, and 6 to 100 layers of the two kinds of substances with different refractive indexes are steamed repeatedly. Finally, a protective layer 60 is provided on the layer 50. I will use the invention to adjust the color of the light emitted by the light source using the soil texture of light interference. Page 7 1222842 _Case No. 92109657_ Year, Month, and Revise The light emission wavelength can be adjusted by adjusting the spacing of the interference layer to obtain the high-saturation specific light color required by the panel, and at the same time, improve the external light emission efficiency of the color light. The following table is for the pixels emitting red (R), green (G), and blue (B) in the present invention, using titanium dioxide (TI 0 2) and silicon dioxide (SI 02) as one of the translucent film interference layers 50 Implementation layers and thickness table: Pixel emission color unit Pixel emission color unit Pixel emission color unit Red Angstrom (A) Green Angstrom (A) Blue Angstrom (Person) TI02 61.33 SI02 86.9 SI02 439.92 SI02 58.98 TI02 87 TI02 79.38 TI02 47.75 SI02 129 SI02 126.39 S102 105.83 TI02 58.3 TI02 77.32 TI02 69.39 SI02 101 SI02 140.43 SI02 82.62 TI02 8S TI02 81.93 TI02 48.11 SI02 104 SI02 131.68 S102 88.31 Ή02 502 TI02 70.31 TI02 63.51 SI02 100 SI02 120 SI02 120 SI02 92.6 SI02 127.83 SI02 84.05 T2 02 53.4 TI02 161.71 TI02 47.61 SI02 69.5 SI02 127.29 SI02 83.26 Ding 102 27.7 TI02 65.43 TI02 42.36 SI02 55.2 SI02 129 SI02 30.58 T102 41.5 TI02 162.19 TI02 44.98 SI02 59.8 SI02 8.0 02 SI02 127 79.8 SI02 468.7 SI02 82.1 Ding 102 44.3 TI02 9.68 TI02 34.6 5 SI02 14.6 SI02 102.92 TI02 51 Total thickness 1372.39 Total thickness 1547 Total thickness 2894.71

Page 81222842 Case No. 92109657_Yueyue 5th, the description of the invention (5) Please refer to "shown in Figure 2", which is a schematic diagram of the intensity-wavelength curve of the present invention 8 1 'as shown in the figure. The molecular organic light emitting diode (pLED) element does not have the translucent film interference layer 50 of the present invention, and the obtained conventional intensity-wavelength curve of 80 is obtained, and the polymer organic light emitting diode (PLED) is passed through the device of the present invention. ) A semi-transparent film interference layer 50 is provided on the element anode layer 40. The intensity-wavelength curve 81 of the present invention can be obtained. Comparing the two, it can be found that the intensity-wavelength curve 81 of the invention is more than the conventional intensity_wavelength curve. 80 obtains a specific light color with high saturation. Please refer to "shown in Fig. 3", which is a schematic flow chart of the manufacturing method of the present invention, as shown in the figure. The present invention is a method for increasing the color saturation of polymer organic light emitting diodes. The main steps include: a) Fabricate a cathode conductive substrate 10, the cathode layer on which a substrate has been patterned ', and a separation wall 7 between the cathodes is provided; b) α is set to emit light of each color (red, green, blue) The light-emitting material layer is on the cathode conductive substrate 10; C) a hole transmission layer 30 is fabricated on the above-mentioned light-emitting material layer, and the hole transmission layer 30 is used to control the overall thickness of the light-emitting element; d) an anode is provided The layer 40 is provided on the above hole transporting layer ^; the main e) is provided with a translucent film to interfere with the anode layer 4 () described above, wherein the layer 5 ° is coated with two different refractive index materials, and is repeated f) coating protection Layer 6 0. In the step 6 described above, the semi-transparent film interference layer 50 is formed between the cathode and the cathode in two steps: 5 gates. The wave repeatedly resonates and interferes in this interval, and the specific light wave is strengthened and concentrated. Intensity of a single wavelength shot Page 91222842 Case No. 92109657 Rev. V. Description of the invention (6) The panel is exited, and the light waves can interfere between the cathode and the half lens. Due to the resonance cavity of different thickness, different light colors can be obtained by resonance Therefore, it is possible to make adjustments and enhancements to each light color of the full-color panel, but the above are only preferred embodiments of the present invention. When the scope of implementation of the present invention cannot be limited by this, that is, the general application according to the present invention All equal changes and modifications made within the scope of the patent shall still fall within the scope of the invention patent.

Page 10 1222842 _ Case No. 92109657_ Year, month and day correction circle type simple description Figure 1 is a schematic diagram of the device of the present invention Figure 2 is a schematic diagram of the intensity-wavelength curve of the present invention Figure 3 is a manufacturing method of the present invention Flow chart [Illustration of drawing number] Cathode conductive substrate ... 10 Light-emitting layer ... 20 Hole-transport layer ......... ... 30 Anode layer ... 40 Translucent film interference layer ... 50 Protective layer ... 60 Partition wall ... ........ 70 Known intensity-wavelength curve ......... 80 Strength-wavelength curve of the invention ......... 81 Cathode conductive substrate ... a a luminescent material layer ... b a hole transmission layer and thickness control ... c Setting anode layer ... d Setting translucent film interference layer ... e Coating protective layer ... ......... f

Claims (1)

By 2842 I A device for increasing polymer organic tritium, which includes the patterning and setting of the organic saturation-polar body color saturation—a cathode separation wall a light emitting layer on the cathode conductive substrate; a conductive substrate, a A hole-transporting layer on the light-emitting layer; an anode on the hole-transporting layer; a translucent film interference layer on the anode; a protective layer on the translucent film interference layer. 2. The dream of the color saturation of the diode element described in item 丨 of the scope of application for patents. &Amp; Door Knife Thousands of Organic Devices First, No Device, wherein the cathode conductive substrate is a patterned lowering layer Conductive substrate. "Κ 3 · The device for increasing the color saturation of a polymer organic light emitting diode element as described in item i of the scope of the patent application, the towel, the light emitting layer of which is a high level of polyethylene dye (PVK) doped organic dye Molecular organic light-emitting layer 4. The device for increasing the color saturation of a polymer organic light-emitting diode element as described in item 1 of the scope of the patent application, wherein the light-emitting layer is a polymer organic polymer made of polyfluorene 5) The device for increasing the color saturation of a polymer organic light emitting diode device as described in item 1 of the scope of the patent application, wherein the semi-transparent film interference layer uses two different refractive index materials to deposit repeatedly 6 to 100 layers. 6 · A method for increasing the color saturation of a South Organic Light Emitting Diode element, the main steps of the process include: a) making a cathode conductive substrate; b) ink-jet printing full-color pixel light-emitting materials on Cathode conductive substrate and baking 1222842 _ case number 92109657_ year month amendment _ six patent application baking; c) making hole transmission layer and control the overall thickness; d) setting anode; e) setting A translucent film interference layer; f) coating a protective layer; wherein the translucent film interference layer in step e above forms a resonance interval between the cathode and the cathode, so that the light wave repeatedly interferes with resonance in this interval, and the specific light wave is interfered in this resonance interval; The concentration is enhanced to obtain a high-intensity single-wavelength emission panel. Page 13