• Technical Name
  • Novel Triplet–Triplet Annihilation Upconversion in Electroluminescence Device
  • Operator
  • Yuan Ze University
  • Booth
  • Online display only
  • Contact
  • 邱天隆
  • Email
  • tlchiu@saturn.yzu.edu.tw
Technical Description This technology demonstrates an organic light-emitting diode based on the mechanism of triplet-triplet annihilation up-conversion (TTAUC). At present, this technology had been successful applied and employed for solid-state organic light-emitting diodes, which can successfully improve device efficiency and operating lifetime. The special of this mechanism is that a simple double-layer structure is used instead of a mixed-layer structure, which can separate the recombination zone and emission zone. The device performance is higher than traditional triplet-triplet annihilation organic light emitting diodes with longer operating lifetime. The blue light efficiency increases 2x with 4x the lifetime improvement. In addition, we introduced the "triple-state diffusion and singlet barrier" to improve the efficiency of the device, and doping a phosphorescent material into the fluorescent material sensitization layer can further improve the efficiency and color purity of the device.
Scientific Breakthrough The operation lifetime of the blue light emitting diode is increased by more than 4.1 times, and the efficiency also increased by 2 times. Before this mechanism was invented, the best triplet-triplet annihilation conversion efficiency is the yellow light emitting material Rubrene, which is about 70%, representing about 70% of the non-luminescent triplet exciton converted into yellow photon. While the commonly used blue material Pyrene, due to triplet-polaron quench the conversion efficiency is less than 40%. The technology has a very high triplet conversion efficiency up to 86.1%. It is currently known as the world's highest conversion efficiency triplet-triplet annihilation so far.
Industrial Applicability Organic light-emitting diodes have the characteristics of self-luminescence, wide viewing angle, high contrast, and thinness compared to traditional liquid crystal displays. They have become quite eye-catching flat-panel displays and daily lighting technology in the next generation. This novel mechanism has the opportunity to replace existing commercial materials and mass-produced systems architectures, which solves the current problem of low blue OLED light emission efficiency and poor operating lifetime. At present, this mechanism had claimed and passed many US and Taiwan patents. It has great patent and mass production value.
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