| Summary: | 碩士 === 國立臺東大學 === 應用科學系 === 105 === The development of light-emitting diodes has changed the way of life today, the replacement of light bulb and other traditional light source. The scope of application covers lighting systems, backlight, display systems and mobile devices, has been hailed as the twenty-first century The most watched technology. QLED (Quantum Dot Light-emitting diode), which has a narrow half-width, high-purity purity quantum dot technology. It will be a new wave of displays in the future when pursuing high-quality, high-performance displays.
Perovskite CsPbX3 (X = Cl, Br, I) was synthesized by chemical hot injection method using colloidal solution as the inorganic luminescent layer. Color of green CsPbBr3 to red CsPbBrxI (3-x) can be synthesized by regulating the different proportions of Group VII A anions; and green CsPbBr3 to blue CsPbCl(3-x) Brx, which covers the color of all visible spectral regions. The inorganic lead halide perovskite quantum dots solution is purified to obtain a very narrow half width (FWHM, Full width at half maximum). In this study, we synthesized four color quantum dots, its half width and width blue: 16.6 nm blue and green: 17.4 nm green: 21.4 nm orange: 25.6 nm. Which is very narrow compared to the CdSe quantum dots material; it also has better color purity for the phosphor material. And then inorganic lead halide perovskite quantum dots made of components of the performance of light color, and the solution is very close to the fluorescent position. Although a little shift, speculation is affected by the other layers of the component, but still can be used to determine the wavelength of the solution fluorescent light color components.
In the production of components, our team to the whole fabrication as the goal of development. In this study, in addition to the synthesis of light-emitting layer of inorganic lead halide perovskite quantum dots also contains the element of the electron injection layer of zinc oxide nanoparticles. However, the size of zinc oxide nanoparticles determines the energy gap. This paper provides a method for the synthesis of different sizes of zinc oxide nanoparticles. Small size of zinc oxide nanoparticles with energy gap at 3.32 eV~7.1 eV, Big size of zinc oxide nanoparticles with energy gap at 3.52 eV~7.0 eV. It can be found that the smaller the particle size, the lower the energy gap contributes to the electron injection of the cathode. As the hole blocking layer more effectively block the loss of holes, so the smaller the particle size of the components of the efficiency can be improved.
This work established three different parameter sets for the production of zinc oxide nanoparticles. Can match the different luminescent layer material with the appropriate zinc oxide nanoparticles, so that components have better efficiency. In the QLEDs with zinc oxide nanoparticles and inorganic lead halide perovskite quantum dots by type IV structure with organic hole- and inorganic electron-transport layers. With the support of very few papers, QLEDs successful release of green light. Even the brightness is only 60 cd/m2. There is still a long distance away from becoming a product, but it is definitely a very promising outcome.
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