| Activator ion doped glass has become one of the research focuses in the field of solid display lighting technology due to its outstanding advantages such as high transparency,high rare earth ion doping concentration,excellent chemical stability and thermal stability,easy processing,and good uniformity.In view of the low efficiency of red phosphor in LED devices at present,which leads to weak emission intensity in the red light area and low color rendering index,this thesis selects borosilicate glass as the matrix,selects Eu3+with excellent red light emission intensity characteristics,Cu+which can be used as a warm color light source to improve the color rendering index,and Sn2+ which can maintain the valence state of Cu+as the dopants,and prepares Sn2+/Eu3+/Cu+single,double,and triple-doped borosilicate luminescent glasses series(SBZS luminescent glasses for short)are tested and analyzed by X-ray diffraction spectrum,infrared spectrum,photoelectron spectroscopy,absorption spectrum,excitation spectrum,emission spectrum,fluorescence lifetime,color coordinates.The main conclusions are summarized as follows:(1)Sn2+,Eu3+,Cu+ single-doped SBZS glasses samples are prepared by high temperature melting method.Under 325 nm excitation,Sn2+-doped glasses samples emit 400-700 nm broadband emission with the strongest peak at 430 nm;Under the excitation of 280 nm,Cu’-doped glasses samples emit 400-600 nm broadband emission with the strongest emission peak at 480 nm.Under the excitation of 395 nm,Eu3+-doped glasses samples emit multiple characteristic peaks in the range of 560800 nm,with the strongest peak wavelength of 617 nm.(2)Sn2+-Eu3+,Sn2+-Cu+and Cu2+-Eu3+double-doped SBZS glasses samples with different doping concentrations are prepared by high temperature melting method:Sn2+-Eu3+double-doped SBZS glasses samples show emission peak of Sn2+at 430 nm,and peaks of Eu3+at 595 nm,617 nm,652 nm and 700 nm under 325 nm excitation(excitation wavelength of Sn2+);Sn2+-Cu+ double-doped SBZS glasses emit 360 to 700 nm broadband emission under 335 nm excitation;Under 395 nm excitation,Eu3+-Cu2+double-doped SBZS glasses samples show emission peaks of Eu3+at 595 nm,617 nm,652 nm and 700 nm.With the increase of Cu2+concentration and the concentration of Eu3+remains unchanged,the emission intensity of Eu3+at 617 nm decreases.The luminescence of Eu3+ can be regulated by changing the concentration of Cu2+.The energy transfer mechanism between Sn2+→Eu3+ and Eu3+→Cu2+is discussed.(3)In the Sn2+-Eu3+-Cu+ triple-doped system,under 325 nm excitation,the 380-750 nm broadband emission with the strongest peak position at 500 nm appears.The luminescence color of the sample can be adjusted by changing the excitation wavelength with the peak position of the strongest emission changes.The sample with triple-doped concentration of 0.5Sn-0.1Eu-0.05Cu achieves white light emission under 375 nm excitation,which has potential application as a new white light emission material. |
