More room for improvement in the emerging field of research

In 1879, Led Flood Lights Manufacturers completed the last step from laboratory to practical lighting, and created a new era of human electrical lighting. Victor I. In 1994, Japanese scientists announced the first white light organic light-emitting diode for lighting.4 More room for improvement In the emerging field of research and application, QLED also has some problems to be further studied. Incredible nanocrystal. As a QLED for lighting, it has 3 outstanding advantages: can emit a full spectrum, that is, covering the entire visible light and infrared light region; they can limit the quantum luminescence properties, and release a smaller bandwidth of color light, emitting

The half-width of the wavelength is below 20 nm, thus showing a more saturated light color; \he quantum efficiency can reach 90%, and there will be more room for improvement in the future (see Figure 4). In January 2015, Changhong also exhibited the world's first curved quantum dot TV at the CES International Consumer Electronics Show in the United States.

In terms of chemical properties, since most of the atoms are located on the surface of the particles, the chemical properties are extremely active, and it is very easy to produce chemical reactions that cannot occur under macroscopic conditions. Among all the properties of quantum dots closely related to excitation and light emission, we are particularly interested in surface effects, quantum confinement effects and size effects.

In 2009, Charlotte of Nix Lighting USA applied quantum dot coatings to blue LEDs and made the world's first quantum dot LED bulb--QLED lamp in the laboratory. So far, the world's major display manufacturers are developing OLED products. Since then, quantum dot technology has entered the stage of non-toxic and environmentally friendly research.

First, there is still a certain gap between the current non-cadmium-based quantum dot products and the cadmium-based quantum dot products; second, the light-emitting mechanism is not very clear, which restricts the development of new materials, so further In-depth research; third, the phenomenon of luminescence quenching in the application conversion process from quantum dots to QLED devices is more serious, and there is still a certain distance compared with GaN-based LEDs; fourth, the research on the electroluminescence performance of quantum dots is still Relatively weak, accelerating this research will be of great significance to the application of new QLED panel lights in the future. 5.