Since the 21st century, the energy crisis has become more and more serious. Energy conservation is an effective way to ease the energy crisis. Therefore, the rapid development of energy-saving lighting and display technology is still necessary. Among these technologies, flexible optoelectronic devices have great appeal in many applications because of their lower fabrication costs and mechanical flexibility. ACEL devices as a lighting and display technology, due to its high resolution, good contrast and brightness, uniform luminescence, making it a great attraction for the LCD screen, backlighting and large architectural decorative lamp industry . However, at a certain voltage, higher brightness and luminous efficiency, that is, how to more energy-saving, become the current challenge.
Wuhan Optoelectronics National Laboratory and Physics Institute of dual-hired professor Dr. Gao Yihua led the research team, according to the field emission tip discharge principle, in the developed flexible ACEL devices carbon nanotubes (CNTs) bottom electrode by adding four corners of acicular zinc oxide crystal Required (T-ZnOw). Under the action of AC electric field, T-ZnOw enhances the electron emission of the bottom electrode and the photo-excitation of the fluorescent material of the luminescent layer, so that the luminescence intensity of the device is obviously enhanced. This ACEL device has a sandwich structure with a top electrode, a light-emitting layer and a bottom electrode and is expected to contribute to saving energy such as liquid crystal displays, backlights, and decorative lights for large buildings.
The research "Enhancing light emission in flexible AC electroluminescent devices by tetrapod-like zinc oxide whiskers" was published on September 28, 2016 in OSA's Optics Express Optical Express (2016, VoL 24, No. 20, pp23419 -23428).
The research has been funded by the National Natural Science Foundation of China (11374110,11204093,11304106,51371085 and) and other projects.
(A) SEM image of (a) T-ZnOw (b) T-ZnOw insertion at bottom electrode of CNTs
Figure 2. Schematic, characterization, spectrogram, and curved glow physical map of photoexcited ACEL devices with T-ZnOw enhancement. (b) T-ZnOw enhanced cross-sectional view of the ACEL device; (c) at a voltage of 200V and a frequency of 1kHz AC, different
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