OLED device with improved light extraction rate through ps microsphere layer and its manufacturing method

Abstract

The invention discloses an OLED (organic light-emitting diode) device for increasing light emitting rate by a PS (polystyrene) microsphere layer. The OLED device comprises an OLED element, a PDMS (polydimethylsiloxane) film and a PS microsphere layer. One side of the PDMS film is attached to a light emitting side of the OLED element, the other side of the PDMS film is attached to the PS microsphere layer, and the PS microsphere layer is in a single-layer structure formed by arraying PS microspheres. The invention further discloses a production method of the OLED device for increasing light emitting rate by the PS microsphere layer. The making method includes the steps of firstly, making the PS microsphere layer on a plane of a carrier pellet; secondly, making a layer of the PDMS film on the light emitting side of the OLED element; thirdly, attaching the side, having the PS microsphere layer, on the carrier pellet with the side, having the PDMS film, to the OLED element, disposing the adhered structure to environment at normal temperature, and allowing for airing and solidifying; and fourthly, taking down the carrier pellet from the OLED element, and allowing the PS microsphere layer to separate from the carrier pellet to be attached with the PDMS film. The OLED device has the advantages of simplicity in implementing equipment, low cost and obviously increased light emitting rate.

Description

technical field [0001] The invention relates to a technology for improving the light extraction rate of an OLED device, in particular to an OLED device and a manufacturing method thereof for increasing the light output rate through a PS microsphere layer. Background technique [0002] OLED refers to Organic light-emitting diodes (OLED for short), which is a new type of flat panel display technology and flat light source, which has the advantages of energy saving, high luminous efficiency, fast response speed, wide viewing angle, and low driving voltage. However, conventional OLED products currently on the market have low light extraction efficiency, only about 20% of the light can be emitted outside the OLED device, and the remaining about 80% of the light is confined inside the OLED device due to total reflection. [0003] In order to improve the light output rate of OLED, many people have carried out research, such as the author is Liu Mo et al. from the School of Electron...

AI Technical Summary

Problems solved by technology

[0005] For the first solution, roughening the light-emitting surface directly, although the process is simple, is likely to cause damage to the device, and the uncertainty of the roughening is likely to lead to poor uniformity of the photoelectric performance of the device

For the second scheme, the basic manufacturing method is to deposit a specific thickness of MgF on the light-emitting surface of the OLED. 2 Membrane, using MgF 2 The characteristic of the refractive index of 1.38 plays the role of the refractive index matching layer, thereby improving the light output; however, the light output rate that can be improved by this structural design is not high, and it is necessary to vacuum-deposit a new layer of material on the outer surface of the OLED. In the evaporation device, The organic polymer properties of each functional layer in the OLED will inevitably be affected, making the performance of the light-emitting device unstable and low in reliability. At the same time, this design scheme also has the disadvantages of complex process and high cost, which is not conducive to industrial mass production.

For the third scheme, a large number of microlenses with a size of tens of microns are arranged in a plane matrix on the microlens film, and the microlenses arranged in a plane matrix scatter light. This method has the following problems. It is a regular array of micro-lens matrix, the scattering of light is uneven, the scattering effect is very poor, it is easy to cause the light output of the light-emitting device to be blurred, and the displayed image is very blurred. Large-scale industrial production is difficult and costly

It can be seen that the existing technology mainly has the following defects: (1) the light output effect is not ideal, which will cause damage to the structure or performance of the OLED itself; (2) it is difficult to realize mass production, the process is complicated, and the cost is high; The scattering effect is poor, and the image display is blurred; (4) The performance of the light-emitting device is unstable and the reliability is low

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