Color-changeable OLED device and preparation method therefor

Abstract

The invention discloses a color-changeable OLED device and a preparation method therefor. The color-changeable OLED device comprises ITO glass, wherein a hole injection layer, a hole transport layer, a first ultra-thin light emitting layer, an intermediate energy transfer regulation and control layer, a second ultra-thin light emitting layer, an electron transport layer, an electron injection layer, and a negative electrode are adhered to the ITO glass from inside to outside in sequence, wherein the first ultra-thin light emitting layer and the second ultra-thin light emitting layer are light emitting materials with different colors; and the intermediate energy transfer regulation and control layer is an main body organic material. The color-changeable OLED device provided by the invention adopts two kinds of ultra-thin light emitting bodies, and is prepared by a physical vapor deposition method; the prepared OLED device can realize wide adjustable color gamut range; and in addition, the OLED device has the characteristics of high efficiency, low roll-off and low cut-in voltage.

Description

technical field [0001] The invention relates to the field of organic light-emitting diode components, in particular to a color-changing OLED device and a preparation method thereof. Background technique [0002] Organic light-emitting diodes (OLEDs) are mainly made of organic light-emitting small molecules and high molecular polymers as light-emitting materials, and are prepared by evaporation or spin coating. At present, OLED lighting products and OLED display panels have been mass-produced. In an OLED display panel, a pixel is usually composed of three-color (red, green, blue) OLED base components, so as to realize the function of color adjustment and color display. Color-tunable light-emitting diodes (CT-OLEDs) can achieve color-tunable functions in a single OLED device, which not only greatly simplifies the fabrication process, especially the complex mask fabrication process, thereby reducing the high OLED fabrication cost , and can minimize pixels to improve the resolu...

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Problems solved by technology

[0005] In view of the above-mentioned deficiencies in the prior art, the object of the present invention is to provide a color-changing OLED device and its preparation method, which uses an ultra-thin light-emitting layer, consumes very little expensive light-emitting materials, and has good performance after optimization, which can solve the existing problems. Color-tunable CT-OLED devices are expensive to manufacture, and have the disadvantages of poor repeatability, poor stability, and poor performance

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