According to Taiwan media reports, Taiwanese scientists have recently produced white light-emitting diodes (LEDs) using zinc oxide (ZnO)/blue light organic composite films. They used a hydrothermal method to successfully grow an array of inorganic ZnO nanorods on a blue organic light-emitting film. This technology is different from the traditional LED epitaxial production method. Not only is the method simple and the whole process is low temperature, it is very attractive for the future development of white light source.
Generally, white light emitting diodes can be classified into inorganic and organic types. In the past, the production of inorganic white light-emitting components has to consider the problem of material lattice matching, and requires high vacuum and high temperature process equipment, so the manufacturing cost is high; and the organic white light-emitting components require expensive and complicated chemical reactions in the development of white light materials, if White light components composed of three layers of RGB organic materials also need to be concerned about the problem of inconsistent luminous intensity and lifetime of each layer of materials.
Prof. Lin Qingfu from the Institute of Optoelectronics of Taiwan University and his doctoral student Li Junyu successfully integrated n-type inorganic ZnO nano-pillar arrays and p-type blue organic materials into pn-type white light-emitting diodes using low-temperature solution process technology. The inorganic/organic composite film has both The advantages of ZnO high carrier mobility, as well as the high fluorescence efficiency of organic materials and the benefits of large-area fabrication, do not have the problem of lattice matching of different materials, and do not require expensive vacuum and high temperature equipment.
According to the research of Professor Lin Qingfu's laboratory, the ZnO nanocolumn will bond with the organic film during the growth process and form Zn(OH)2, which is the source of the surface of the zinc oxide, so when the component is biased The electron hole pair is easily recombined between the surface of the ZnO nanocolumn/organic molecular interface, and generates photons covering a large number of wavelengths of zinc oxide surface defects and blue light organic materials, thereby obtaining white light.
The team used Fourier-Transform Infrared Spectrometer (FTIR) to observe that the spectrum of the ZnO/blue-light organic composite film prepared by hydrothermal method has a strong peak at 3410 cm-1 corresponding to the hydroxyl group, which proves the composite. The film does contain a large amount of Zn(OH)2.
Generally, white light emitting diodes can be classified into inorganic and organic types. In the past, the production of inorganic white light-emitting components has to consider the problem of material lattice matching, and requires high vacuum and high temperature process equipment, so the manufacturing cost is high; and the organic white light-emitting components require expensive and complicated chemical reactions in the development of white light materials, if White light components composed of three layers of RGB organic materials also need to be concerned about the problem of inconsistent luminous intensity and lifetime of each layer of materials.
Prof. Lin Qingfu from the Institute of Optoelectronics of Taiwan University and his doctoral student Li Junyu successfully integrated n-type inorganic ZnO nano-pillar arrays and p-type blue organic materials into pn-type white light-emitting diodes using low-temperature solution process technology. The inorganic/organic composite film has both The advantages of ZnO high carrier mobility, as well as the high fluorescence efficiency of organic materials and the benefits of large-area fabrication, do not have the problem of lattice matching of different materials, and do not require expensive vacuum and high temperature equipment.
According to the research of Professor Lin Qingfu's laboratory, the ZnO nanocolumn will bond with the organic film during the growth process and form Zn(OH)2, which is the source of the surface of the zinc oxide, so when the component is biased The electron hole pair is easily recombined between the surface of the ZnO nanocolumn/organic molecular interface, and generates photons covering a large number of wavelengths of zinc oxide surface defects and blue light organic materials, thereby obtaining white light.
The team used Fourier-Transform Infrared Spectrometer (FTIR) to observe that the spectrum of the ZnO/blue-light organic composite film prepared by hydrothermal method has a strong peak at 3410 cm-1 corresponding to the hydroxyl group, which proves the composite. The film does contain a large amount of Zn(OH)2.
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