Grain boundary limits the performance and application of CdZnTe nuclear radiation detectors. In order to explore the influence of grain boundary in CdZnTe crystals on device performance, the space charge distribution and internal electric field distribution of CdZnTe crystals containing grain boundary were simulated by Silvaco TCAD technique. The simulation results demonstrated that the energy bands at the CdZnTe grain boundary were bent upward in the thermal equilibrium state, forming a back-to-back Schottky barrier. When the applied bias voltage was increased, the overall energy band structure of the Au/CdZnTe/Au tended to tilt from the cathode to the anode and the internal electric field increased with the increase of the applied bias voltage. The dead zone in the crystal gradually decreased and the internal electric field was linearly distributed, which helped to improve the carrier collection efficiency in the device. In addition, the grain boundary defect concentration can regulate the internal electric field distribution of CdZnTe, thus affecting the carrier transport properties.
The color shift problem caused by OLED aging has always been a hot issue in the field of OLED display. The difference of pixel attenuation rate of different colors will seriously affect the display effect of the device. In this paper, image signal generators and lifetime testers were used to test the brightness and color coordinate changes of OLED display under different initial brightness during the aging process. In addition, the causes of white dot color shift and the trajectory of color shift were explored. The research results show that the reduction of blue light ratio caused by the rapid decay of blue pixel efficiency is the cause of the color shift of the white picture, and the color shift trajectory from the white light area to the yellow light area causes the white picture to be yellowish. In order to correct the color shift of the white screen, the thickness of the HIL (hole injection layer) is optimized. The study found that when the thickness of the hole injection layer is 1070 Å, the chrominance efficiency of blue pixels can be kept in the peak area, and the improvement effect is significant, the slope of the color shift locus is reduced to 1.26, the color shift value is reduced from 0.0051 to 0.0017, and the JNCD is less than one.
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