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Rare Earth Activated Sr3Al2O6 Host Phosphors Used for InGaN Chip Base Light Emitting Diodes

Author: ZhangHongMei
Tutor: WangDaJian
School: Tianjin University of Technology
Course: Condensed Matter Physics
Keywords: White light emitting diodes Sr3Al2O6 base Red phosphor White phosphorescent powder Eu3 / Eu2
CLC: TN104.3
Type: Master's thesis
Year: 2008
Downloads: 136
Quote: 1
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Abstract


White light-emitting diodes (WLEDs) the advent of semiconductor technology development in the microelectronics revolution triggered later in the birth of a new industrial revolution - lighting revolution. Due WLEDs small size, resistant to vibration, fast response, long life and non- pollution, etc., will become the alternative to incandescent, fluorescent and high intensity discharge lamps, the fourth generation light sources. Currently blue LED chip / YAG: Ce mode except the problems WLEDs efficiency and life, the one of the problems is the need to develop new basket blue or violet red excitable non-sulfide fluorescent material, to further improve the display white color index. This work was supported around the stoichiometric ratio of the matrix Sr 3 Al 2 O 6 emitting materials, research in the ultraviolet and blue or violet light excitation under red and white material preparation, structure and spectroscopic properties. This research work is mainly the result of innovative get the following: [1] proposed in a nanoscale boehmite as aluminum source material composite sol spray - pyrolysis method successfully prepared orange-red light phosphor Sr 3 < / sub> Al 2 O 6 : Eu, Dy 3 , implements a non-metallic alkoxide hydrolysis phosphor sol - gel preparation. [2] The prepared Sr 3 Al 2 O 6 : Eu, Dy 3 orange light phosphor photoluminescence spectra show that the phosphor from 400nm to 500nm with a broad excitation band, the emission wavelength range of GaN good match, and to 595nm emission band centered, thus helping to improve the existing blue chip / YAG: Ce 3 -type WLEDs device CRI. [3] In the phosphor Sr 3 Al 2 O 6 : Eu, Dy 3 , the orange light comes from luminescent centers Eu 2 ions. Samples corresponding emission spectra Eu 3 and Eu 2 size relative emission intensity ratio is calculated, indicating Zn 2 partial replacement of cations and Sr < sup> 2 lattice vacancies can promote the introduction of further Eu 3 to Eu 2 of reduction, thereby further improving the luminous efficiency of the phosphor. Empirical formula using both Van Uiltert explores Eu 2 in different samples have different shade of nature. [4] using high temperature solid matrix obtained single white phosphor Sr 3 Al 2 O 6 : Dy 3 . The excitation at 350nm phosphors emit yellow light (578nm) and blue (484nm), respectively, corresponding to the Dy 3 ion 4f 9 configuration within the 4F 9/2 , respectively, to 2H 13/2 and 2H 15/2 transitions. Both decay rate consistent light combined into what we see white, color stability for the near-ultraviolet excitation afterglow diode chip provides the basis for the preparation of. [5] Dy 3 at different lattice Ba 3 Al 2 O 6 , Sr 3 < / sub> Al 2 O 6 and Ca 3 Al 2 O 6 in The research results show that the characteristic emission in Ba 3 Al 2 O 6 lattice Dy 3 characteristic emission and another two kinds of lattice rather weak in comparison. We believe that this phenomenon is due to the lattice Ba 3 Al 2 O 6 in [AlO 4 ] between connection is different from the Sr 3 Al 2 O 6 in the resulting Dy 3 crystal field around different , and in the Dy 3 on the luminescence properties differ.

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