Research On Energy Transfer And Quantum Cutting Of Rare Earth Ions

The white light-emitting diodes （W-LEDs） have been regarded as the fourth generationof solid-state light sources, following incandescent, fluorescent and high-pressure gasdischarge lamp, due to their excellent advantages such as higher luminous efficiency, energysaving, fast response, longer lifetime, better reliability and environment protection. Atpresent, the commercialized W-LED is consisting of a blue LED chip and yellow-emittingYAG phosphors mixed white light output. The performance of the LED chips and phosphorsdetermined the output of the W-LED, so the researches on phosphor or luminescent glasssuitable for near-UV excitation seem particularly important.Recently, the spectrum cutting is the highlights of the rare earth luminescent materials.Through spectral tailoring material tailor it to better match between the spectral distributionsof the spectral response of the solar cell conversion efficiency of polycrystalline silicon solarcells, which is expected to exceedlimit. Quantum cutting is one of the solar spectrum methodfor spectral tailoring, though which will be in the utilization of one high-energy photonconversion of two or more low energy photons, and to improve the energy of the individualphotons in the ultraviolet region. Therefore, the research for a suitable quantum cuttingmaterials for solar cell development is significance.In this paper, we have done the following contents:（1） The energy transfer from Ce³⁺to Tb³⁺and Mn²⁺has been investigated.Ce-Tb-Mn co-doped borosilicate glass emitting white light for346nm excitation.Inverstigated on the spectral characteristics of Dy³⁺ions doped borosilicate glass, whichachieve a single substrate white light emission. The both two glasses have potentialapplications in white LED.（2） Select the of NaY type of zeolite as the doped matrix, use the water bath exchangemethod, preparation of Ce³⁺-Yb³⁺doped series of samples and Eu²⁺-Yb³⁺doped series ofsamples respectively, test their excitation spectra, fluorescence spectra, fluorescence decaycurve, to studies of Ce³⁺-Yb³⁺、Eu²⁺-Yb³⁺quantum cutting in zeolite materials. Explore thepotential applications of the material in the solar cell.