组合方法筛选新型发光材料

结合作者课题组开展的工作,简要介绍了组合方法在发光材料研究中的应用.包括:适用于发光材料库合成的组合溶液喷射和原位掩模薄膜顺序沉积技术;应用于发光材料库高通量筛选的照相术、组合扫描光谱和组合真空紫外发光表征系统.列举了组合方法在稀土聚合物敏化发光材料、真空紫外发光材料和长余辉发光材料等研究中的应用.

Combinatorial Approach to Advanced Luminescent Materials

The progresses of our group in combinatorial luminescent materials are reviewed.A combinatorial inkjet delivery system was developed to synthesize the powder phosphors libraries.The system consists of eight independent piezoelectric inkjet heads and an x-y stage that controlled by a computer via the driving circuit and motion controller.Thin-film deposition conjunction with a combinatorial masking strategy is used to(synthesize)high-density thin-film phosphors libraries.Photography using either film cameras or digital charge-coupled devices can be used to characterize the luminescent intensities and color coordinate of a phosphors library by taking the photoluminescent photograph of the library under UV or other high-energy excitations.For more quantitative analysis,an automatic scanning spectrometer system is used to measure the emission spectra of luminescent samples in the library.This system consists of a mercury lamp,a portable optical fiber spectrometer and an x-y stage.To implement the high throughput screening of VUV phosphor library,a parallel screening apparatus for VUV photoluminescence was developed,which consists of a cathode gas(Xe/He or Xe/Ne)discharge lamp and a vacuum characterization chamber.The photoluminescence of the phosphors library that excited by the VUV emission are photographed outside the chamber through an optical window.The luminescence enhancement effect of different kinds and contents of rare earth complexes(RE-(DBM)₃phen,RE=Dy,La,Gd,Sm,Y,DBM=dibenzoylmethane,phen=1,10-phenanthroline)sensitized Eu(DBM)₃phen doped in poly(methyl methacrylate)(PMMA)matrix was investigated using combinatorial method.The La(DBM)₃phen shows the highest sensitization efficiency.At the optimal content of 5%(mass fraction)Eu(DBM)₃phen and 350 kg/mol number average molecular weight(Mn)of PMMA,the maximum sensitization efficiency of La(DBM)₃phen is about 20 times.Through the combinatorial method,a efficient VUV red phosphor GdSr(B_xP_2-x)O_5.5~7.5:Eu_0.1 was identified from a RE doped borophosphate phosphors libraries.It is believed that the dominant transition in GdSr(B_xP_2-x)O_5~7:Eu_0.1 is ⁵D₀→⁷F₀.The scale up experimental results show that the bulk GdSr(B_xP_2-x)O_5.5~7.5:Eu_0.1 sample prepared by conventional(methods)is brighter than that of the famous red commercial phosphor Y₂O₃:Eu under the same excitation(condition.)The combinatorial study of long persistence phosphor is in progress.