Synthesis, Characterization Of RE Doped Fluoride Nanocrystals And Its Application In Organic Optical Waveguide Amplifiers

Photo-communication has changed world deeply, under this revolution,guided-wave optical device and optical waveguide technology developed rapidly aswell, and in the near future, they will take a significant role in the domain ofPhoto-communication. Aiming to amplify optical signal in optical waveguide, Peopleinvented the waveguide amplifier. Compared with the inorganic waveguide amplifier,polymer waveguide amplifier has many advantages, such as more convenient tochange the index of refraction, better plastic property, easier technic and cheaper inprice. So polymer waveguide has vast application prospect.RE doped fluoride nanocrystals are exellent material of core layer of polymerwaveguide amplifier. This paper is mainly about the research in RE doped fluoridenanocrystals applied to polymer waveguide amplifier, includes the following items:1. The synthetic methods of fluoride nanocrystals were researched. We useddifferent methods to synthesis fluoride nanocrystals, included solvothermal methodand several different thermal decomposition methods. After characterizing thesefluoride nanocrystals synthetized by different method and made a comparison in theproperties of particle size, appearance, optical spectrum, and solubility, we found thatthe thermal decomposition method that solution mixed oleylamine was bettersynthetic method to obtain the RE doped fluoride nanocrystals used for polymerwaveguide amplifier. 2. We comparised multiple Er doped fluoride nanocrystals which used for corelayer of polymer waveguide amplifier. We obtained β-NaYF4:Yb3+, Er3+.β-NaLuF4:Yb3+, Er3+.-NaLuF4:Yb3+, Er3+.-NaYF4:Yb3+, Er3+and LiYF4:Yb3+,Er3+synthetized by the same method. The nanoparticles was characterized by TEM,found that the size of these different samples were all almost15nm. We comparedinfared spectrum and infared emission intensity of these sample pumping with980nmlaser, the β-NaLuF4nanocrystals codoped Er and Yb had srongger infared emissionthan others fluoride nanocrystals near1550nm, when the size of nanoparticles wassmall. So we drew a conclusion that β-NaLuF4:Yb3+, Er3+was better materials forcore layer of polymer waveguide amplifier.3. We researched that the relationship between the gain of polymer waveguideamplifier and the size of nanoparticles in core layer. We respectively obtain8nm,15nm and23nm β-NaLuF4: Yb3+, Er3+synthetized via the same method, and doped thethree kinds of nanoparticles in waveguide amplifiers by same process respectively.Then measured the gain of the three waveguide amplifiers at almost same conditions.The gain of the waveguide amplifier doped8nm nanocrystals is bigger than others, itshows that the8nm fluoride nanocrystals is more suitable for doping core layer ofpolymer waveguide amplifier.