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The ferroelectric thin film is a ferroelectric properties and a thickness of several tens of nanometers to several microns of film material , which has good ferroelectric , piezoelectric, pyroelectric , electrooptical and nonlinear optical characteristics , etc. , can be widely used in the field of microelectronics , optoelectronics , integrated optics and micro-electro-mechanical systems , has been the forefront of high-tech research and one of the hot spots . Select a barium titanate as the research object , to analytically pure acetic acid barium titanate is tetrabutyl raw materials, glacial acetic acid as solvent , acetylacetone as stabilizer , by sol - gel method prepared barium titanate on silicon substrates ferroelectric thin films . Study the crystallization conditions, surface morphology and photoluminescence properties of barium titanate ferroelectric thin films . The test results show that the 600 ° C for 8 hours annealing barium titanate thin films showed a crystalline state , the annealing treatment of the sample film is still below 400 ℃ amorphous ; film surface of the island structure , smooth and compact , no obvious cracks and holes, etc. defects. Film PL spectra show room temperature amorphous ferroelectric thin films of barium titanate has a strong photoluminescence , wherein the blue excitation light after 8 hours 400 ° C annealed samples film luminescent properties at 540 the ~ 660nm issued strong yellow , the peak wavelength of 580 ~ 610nm, the peak width of 30nm . Crystalline ferroelectric thin film of a barium titanate without any luminous phenomenon . MOCVD technology to optimize the preparation of the quantum well blue LED chip , chip light emitting stable performance , the peak wavelength of 455nm , half-height Kuanjin change 2.3 nm as the injection forward current between 0-150mA . Barium titanate film with a portfolio of blue chip white LED Discover the test . The results showed that the sample device emits blue - white light , not very white , light color and color coordinates of ( 0.2139,0.1627 ) , close to the white light point ( 0.33, 0.33 ) . The papers prepared sample performance of the device and the commercialization of white LED there is a wide gap between the need to be further improved.
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