According to foreign media reports, The research team of Zhou Shengjun of Wuhan University used a full-angle distributed Bragg Reflector (DBR) to improve the performance of blue and green light flip-fit MiniLED chips.
According to the report, the research team launched a new full-angle Ti3O5 (pentoxide tripeptide)/SiO2 (silicon dioxide) DBR, which can improve the luminous efficiency of blue and green light flip-fit MiniLED chips, which is of great significance for achieving efficient flip-up blue-green miniLED displays.
The full-angle Ti3O5/SiO2 DBR contains different DBR stacks that are optimized to match the needs of different center wavelengths in the blue, green, and red wavelength regions. Compared with traditional DBR, full-angle Ti3O5/SiO2 DBR reduces the limitation of reflection angle and increases the acceptable range of reflectable wavelengths.
In this study, the research team used highly reflective ITO (indium tin oxide)/DBR and Ag/TiW p-type ohmic contacts to create two blue and green flip-fit MiniLED. Compared to Ag/TiW, the light incidence angle of ITO/DBR is increased from 0° to 60°, so higher reflectivity can be obtained in the wavelength range of 420-580 nm.
The results show that compared with the optical output power of Ag/TiW-based blue and green MiniLED, the optical output power of blue and green MiniLED based on ITO/DBR is increased by about 7.7% and 7.3%, respectively, under the condition of 10mA injection current. At the same time, the full-angle Ti3O5/SiO2 DBR also improves the side light intensity of the flip-chip MiniLED, which is conducive to the mixing of LCD backlight systems.
The study has now been published in the journal Optics Express. (Compiled by LEDinside Janice)
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