The approach to making full-color OLED devices

1. RGB device superposition mode

This mode of color display does not require light color conversion or color filters, thus improving the luminous efficiency. This superposition mode requires good material performance and driving characteristics, and high process conditions.

2. Blue light device + luminescent color conversion layer mode

This model was first successfully developed by Idemitsu Corporation of Japan. Blue organic electroluminescent devices have the highest luminous energy, so blue light is allowed to pass through the luminescent color conversion medium to stimulate the production of green and red light. The structure of this blue light organic electroluminescent device is anode/hole injection layer/hole transport layer/emission layer/electron transport layer/cathode, in which the emission layer is DSA blue light organic electroluminescent material.

The luminous efficiency is 61m/W and the life span is 20,000 hours. On this basis, a multi-color organic electroluminescent device is produced using the luminescent color conversion medium mode. This process requires an efficient blue luminescent layer.

3. White light device + color filter mode

The first company to develop this technology was TDK of Japan. The light emitted by the white light device is colored by a color filter. The color filter is expensive and has low luminous efficiency. Although this mode can achieve high color purity, the aging characteristics of the red, green and blue color method optical devices are different, and the color purity will change over time.

The following are three colorization schemes: