OLED alloy cathode and preparation method thereof

A kind of alloy and cathode technology, which is applied in semiconductor/solid-state device manufacturing, electrical components, electric solid-state devices, etc., can solve the problems of unbalanced device positive load carrier injection, weak ability of cathode to emit electrons, easy oxidation or peeling, etc. Achieve the effects of reducing the difficulty of preparation, easy control of film thickness, and reducing the difficulty of operation

Active Publication Date: 2015-10-28
西安拓创光芯科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Because single-layer metal cathodes such as Mg and Li have poor stability in the atmosphere and are easy to oxidize or peel off, metals with low work functions and metals with high work functions are often evaporated together to form alloy cathodes to improve the stability and relia

Method used

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  • OLED alloy cathode and preparation method thereof
  • OLED alloy cathode and preparation method thereof

Examples

Experimental program
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Effect test

Example Embodiment

[0023] A method for preparing an OLED alloy cathode includes the following steps:

[0024] Step 1. Preparation of Ca, Mg and Al raw materials: Weigh Ca: Mg: Al = 15%: (5%-25%): (80%-60%) by mass ratio using an electronic balance of 1 / 10,000 , Mg, Al raw materials;

[0025] Step 2: Preparation of the quartz glass tube: cut the required length of the quartz glass tube, and use the mixed gas of oxygen and liquefied gas to melt and seal one end of the quartz glass tube for use;

[0026] Step 3: Sealing of raw materials: Put the weighed Ca, Mg, and Al raw materials into a quartz glass tube whose one end is closed, and while evacuating the quartz glass tube, use a mixture of oxygen and liquefied gas to burn the other end of the quartz glass tube. Fusion seal

[0027] Step 4. Preparation of alloy cathode: Put the sealed quartz glass tube containing raw materials into the high-temperature sintering furnace. The temperature setting of the high-temperature sintering furnace is stepwise. First,...

Example Embodiment

[0028] Example 1:

[0029] This embodiment is an OLED alloy cathode, which includes 20% Mg, 15% Ca, and 65% Al. Among them, the work function of Al is 4.28 ev, the work function of Mg is 3.7 ev, and the work function of Ca is 2.87 ev. The vacuum melting method is used to melt in a quartz glass tube under vacuum conditions and then naturally cool to form.

[0030] The preparation process is as follows:

[0031] Step 1. Preparation of Ca, Mg, and Al raw materials: use a one-ten thousand electronic balance to separate the required Al wire, Ca particles, and Mg particles at the mass ratio of Ca: Mg: Al = 15%: 20%: 65% Weigh well

[0032] Step 2. Preparation of the quartz glass tube: cut off the required length of the quartz glass tube, and use the mixed gas of oxygen and liquefied gas to melt and seal one end of the quartz glass tube for use;

[0033] Step 3. Sealing of raw materials: Put the weighed Ca, Mg, and Al raw materials into a quartz glass tube whose one end is closed. While the...

Example Embodiment

[0035] Example 2:

[0036] This embodiment is an OLED alloy cathode, which includes 5% Mg, 15% Ca, and 80% Al. Among them, the work function of Al is 4.28 ev, the work function of Mg is 3.7 ev, and the work function of Ca is 2.87 ev. The vacuum melting method is used to melt in a quartz glass tube under vacuum conditions and then naturally cool to form.

[0037] The preparation process is as follows:

[0038] Step 1. Preparation of Ca, Mg, Al raw materials: use a one-tenthousandth electronic balance to separate the required Al wire, Ca particles, and Mg particles at the mass ratio of Ca: Mg: Al = 15%: 5%: 80% Weigh well

[0039] Step 2. Preparation of the quartz glass tube: cut off the required length of the quartz glass tube, and use the mixed gas of oxygen and liquefied gas to melt and seal one end of the quartz glass tube for use;

[0040] Step 3. Sealing of raw materials: Put the weighed Ca, Mg, and Al raw materials into a quartz glass tube whose one end is closed. While the quar...

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Abstract

The invention provides an OLED alloy cathode and a preparation method thereof. The OLED alloy cathode is Ca, Mg, Al ternary alloy. The Ca, Mg, and Al are mixed according to a ratio of Ca: Mg: Al = 15%: (5%-25%): (80%-60%) and are formed by being melted through a vacuum melting method in a quartz glass tube under the vacuum condition and being cooled naturally. The Ca-Mg-Al alloy cathode is improved in emissive capability and superior to a Ca: Al alloy cathode OLED device, and can be evaporated by one evaporation boat. As a result, not only is difficulty in operation reduced, but also a film thickness is easier to control and a result is more accurate.

Description

technical field [0001] The invention belongs to the technical field of OLED display and lighting, and in particular relates to an OLED alloy cathode and a preparation method thereof. Background technique [0002] Organic electroluminescent devices belong to carrier injection type light emitting display devices. The electrode is an important factor affecting the performance of OLED devices, that is, whether the positive load carriers can balance injection and effective recombination. If the carrier injection on both sides is unbalanced, excess carriers will reach the electrode, resulting in the quenching of light emission at the electrode, and electrons in most organic light-emitting devices are minority carriers. To improve the performance of the device, it is necessary to increase the electron injection. , that is, to improve the emission ability of cathode electrons. Since most of the LUMO energy levels used in organic materials are between 2.5 and 3.5eV, the lower the w...

Claims

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Application Information

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IPC IPC(8): H01L51/52H01L51/56
CPCH10K71/60H10K50/82
Inventor 张方辉杜帅宋得瑞王璐薇程君李怀坤孙立蓉
Owner 西安拓创光芯科技有限公司
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