Study On Preparation And Spectroscopic Properties Of 1.34μm NIR Luminescence Materials

Integrated optical circuit (IOC) has been rapidly developed. However, the optical loss during the optical information processing and transmission has been a significant barrier in the development of IOC. In order to compensate the optical loss, active optical waveguide devices which can amplify optical signals should be integrated on integrated optical circuit. Rare earth is important in making active optical devices. In particular, the transition of 4F3/2-4I13/2 of Nd3+ion leads to the peak emitting wavelength at 1.34 um, the second standard telecommunication wavelength, which is also the zero dispersion transmission window of SiO2 fiber (or planar optical waveguide) and the most low-loss dissipation transmission window of polymer fiber (or planar optical waveguide). Nd3+ ion doped materials will show preponderant properties comparing with other rare earth doped materials.The research progress and the facing difficulties of active planar optical waveguide were systematically summarized and reviewed in this paper. In this work, we have prepared and studied the near infrared (NIR) luminescence properties of hydrated neodymium binary/ternary complexes. Nd(TTA)3(TPPO)2 was doped in VTES-derived film by pre-doped and NdQ3 was in situ synthesized in the VTES-derived film by a multi-step sol-gel process and exhibited enhanced NIR photoluminescence. At last, low-hydroxy ZrO2-SiO2 binary oxide gel glasses applied in NIR active waveguides were prepared by non-hydrolytic sol-gel method using SiCl4, ZrCl4 and C2H5OH as reactants.We have prepared a series of neodymium binary/ternary complexes, such as Nd(AcAc)3'2H2O, Nd(TFA)3'2H2O, Nd(HFA)3'2H2O, Nd(DBM)3'H2O, Nd(AcAc)3Phen, Nd(TFA)3Phen, Nd(HFA)3Phen, Nd(DBM)3Phen, Nd(TTA)3(TPPO)2, Nd(HFA)3(TPPO)2, Nd(AcAc)4Hpy, Nd(TTA)4Hpy and NdQ3. The effects of organic ligands, synergistic coordination agents and different substitution groups for -diketones on effective line width and photoluminescence intensity of neodymiumcomplexes were investigated. The photoluminescence spectra indicate that synergistic coordination agents can shield neodymium ion and impede water molecules penetrating into inner coordination shell to satisfy large coordination number of Nd3+ during hydrous synthesis process, so the luminescence intensity of neodymium ternary complexes is stronger than that of neodymium binary complexes. The complex Nd(TTA)3(TPPO): has the best photoluminescence properties among the investigated complexes. We also found fluorinating organic ligands couldn't improve the intensity due to effective quenching of coordinating H2O during hydrous synthesis process.On the basis of studying photoluminescence properties of neodymium complexes, we prepared VTES-derived films doped with Nd(TTA)3(TPPO)2 by pre-doped process and NdQ3 by in situ synthesis technique. NIR luminescence due to Nd3+ ions from the VTES-derived films was observed, with peak shape similar to that of pure complexes. This indicates the ligands indeed effectively shield Nd3+ ions from the chemical microenvironment and giving evidence of the lack of strong chemical interactions with the host matrix when the complex was embedded in the VTES-derived matrix. We also found the evidence that energy transfer exists between 8-hydroxyquinoline and Nd3+ ions.Hydroxy group (OH) can quench NIR luminescence. In order to low the concentration of OH in material, SiO2 and SiO2-ZrO2 gel glasses were fabricated by non-hydrolytic sol-gel (NHG) process. The structures of gel glasses were characterized by IR spectra. The concentration of Si-OH in SiO2 gel glasses fabricated by NHG was estimated and lower than that by hydrolytic sol-gel. The influences of the compositions and heat treatment temperature on the refractive index of SiO2-ZrO2 gel glasses were also investigated. After treated at 150 , the refractive index of SiO2-ZrO2 gel glasses could be adjusted in the range of 1.438-1.546 by altering the Zr content.