Abstract
We present a display consisting of a 64-cell quantum dot (QD) light-emitting diodes (LEDs) array manufactured by spin coating and steel plate design evaporation technology. The QDLED pixels in the array can be driven independently. The surface of perovskite nanocrystal (NC) composite was modified by using pure natural material aloe-vera gel as the organic precursor to obtain high-quality narrow band photoluminescence emission all-inorganic CsPbBr3 perovskite NC composites. Here, an open-source Arduino microcontroller unit was used as the dynamic micro-control terminal, combined with a step-down module and four motor drive modules to make the display driver circuit. Finally, a 99% operating rate and a maximum brightness of 3366 cd $\text{m}^{-2}$ were achieved in the 8 $\times $ 8 perovskite QDLEDs array display. Furthermore, an electroluminescence dynamic pattern display based on a 64-cell QDLEDs array display has been successfully demonstrated. This study demonstrates the potential of perovskite devices for next-generation displays.
Highlights
Solution-synthesized perovskite nanocrystals (NCs) were expected to be used in light-emitting applications due to their excellent properties, including a tunable emission wavelength with narrow half-width at full maximum (FWHM), a high photoluminescence quantum yield (PLQY) and a wide color gamut [1]−[4]
We propose for the first time light-emitting diodes (LEDs) based on CsPbBr3 perovskite NC composites as the basic unit for manufacturing 8 × 8 perovskite QDLEDs array display, as well as an inexpensive open source Arduino microcontroller system to control the dynamic pattern of the display
The normalized absorption and PL spectra of CsPbBr3 perovskite NC composites were shown in Fig. 2a, in which a strong green PL emission peak was located at about 522.2 nm with the narrow full width at half maximum (FWHM) of 22.39 nm, indicating that the CsPbBr3 perovskite NC composites have high color purity
Summary
Solution-synthesized perovskite nanocrystals (NCs) were expected to be used in light-emitting applications due to their excellent properties, including a tunable emission wavelength with narrow half-width at full maximum (FWHM), a high photoluminescence quantum yield (PLQY) and a wide color gamut [1]−[4]. Due to the desorption of the unstable capping ligand, the disappearance of the protective shell leads to the loss of luminescence efficiency Such as surface engineering, inner doping, and matrix encapsulation have been used to solve the stability problem of CsPbX3 materials [13]−[16]. Light-emission layer of LED for display applications mainly use organic fluorescent molecular materials or cadmium series II−IV quantum dots (QDs). They still have problems in LED display applications, such as complex preparation process of the organic light-emission layer, high cost, narrow color gamut, and low color purity. The perovskite electroluminescent QDLEDs with high color gamut and low toxicity still needs further research
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