Silver nanocube-based solution organic light emitting diode and preparation method thereof

Abstract

The invention discloses a solution organic light emitting diode based on a silver nanocube, comprising a sequentially laminated anode, a hole transport layer, a light emitting layer containing silvernanocube, an electron transport layer, and a cathode. The invention also discloses a preparation method of a solution organic light emitting diode based on silver nanocube: firstly, the ITO glass substrate is thoroughly cleaned, then a hole transport layer is spin-coated to prepare the hole transport layer, the hole transport layer comprises a silver nanocube light emitting layer, and then an electron transport layer and a metal electrode are sequentially prepared by evaporation in vacuum. The invention has the advantages that the silver nano cube is dispersed in the light emitting layer, theluminous efficiency of the organic light emitting diode is effectively improved by utilizing the plasma resonance effect of the silver nano cube, the preparation method is simple and easy, and has potential application value.

Description

technical field [0001] The invention relates to the technical field of organic electroluminescence, in particular to a solution organic light-emitting diode based on silver nanocubes and a preparation method thereof. Background technique [0002] Organic electroluminescent device (OLED), as an active electronic device that converts electrical energy into light energy, has many advantages such as high brightness, fast response, low power consumption, soft color, light weight, flexibility, and low cost. It has broad application prospects. At present, the most commonly used method for preparing OLEDs is the evaporation method, which requires precise doping, complex processes, and strict requirements, which increases the difficulty of mass production control and increases production costs. The solution processing method is not only low in cost and easy to operate, which is conducive to mass production, but the efficiency and performance need to be improved. [0003] Incorporat...

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Problems solved by technology

[0004] At present, the common method of introducing metal nanoparticles into OLED devices is to introduce them into other organic layers that are close to the light-emitting layer. The effect of body on OLED, in which Ag nanoparticles are doped in the LiF layer on the cathode side by thermal evaporation; in the literature Advanced materials, 2012, 24, 5499–5504, chemically synthesized gold nanoparticles were also tried The particles are placed on the anode side; in the literature Organic Electronics, 2010, 11, 1172–1175, a gold nanoparticle layer is inserted into the cathode side of the green phosphorescent OLED device by thermal evaporation; in these works, metal nanoparticles have played a role in promoting OLED device performance, but the improvement effect is not obvious. The main reason is that on the one hand, the nanoparticles are not placed in the light-emitting layer, so they are far away from the light-emitting excitons, and the coupling effect with the excitons is small. On the one hand, the selected nanoparticles have no edges and corners, so the resonance strength formed is not strong, which weakens the effect of LSPR

Therefore, using angular metal nanoparticles and introducing them into the solution-processed organic light-emitting layer is an effective method to improve the performance of solution-processed OLED devices, but there is no related report.

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