Eu (Ⅱ) or Eu (Ⅲ) to stimulate the synthesis of metaphosphate, light-emitting diode and its application in research

Title: Eu (Ⅱ) or Eu (Ⅲ) to stimulate the synthesis of metaphosphate, light-emitting diode and its application in researchAuthors: Feng Zhang LeiDegree-granting units: Sun Yat-senKeywords: semiconductor light-emitting diode;; high-temperature solid-phase method;; Y (PO_3) _3: xEu ~ (3);; BaCa (PO_3) _4;; Eu ~ (3)-doped red phosphors;; Eu ~ (2 );; Mn ~ (2) co-dopedSummary:

Since 1996, after the advent of the first white LED, because of its long life, energy saving, green lighting, and other significant advantages has been hailed as a new generation of lighting. However, as applied to ~ 400 nm near-ultraviolet - UV-chip three color Magnetic lifter phosphor mainly traditional phosphors, these traditional phosphors excited by near ultraviolet light efficiency is not high, and one of the green and red phosphors phosphors are sulfides, poor stability, in the process of preparation and use of the environment likely to cause pollution, making the white LED luminous efficiency and service life is not easy to improve. Therefore, the study of new InGaN-LED with a phosphor with important academic significance and practical application. The dissertation is to find suitable near-ultraviolet InGaN-based LED with a fluorescent transformational new, efficient, and stable phosphors were studied to be suitable for conversion near-ultraviolet InGaN-based white LED with a fluorescent rare-earth ion Eu (Ⅱ / Ⅲ) doped inorganic phosphors, and the use of XRD (X-ray diffraction characterization of its structure, a detailed study of their photoluminescence properties, and finally, better fluorescent properties of selected compounds in combination with the near-ultraviolet InGaN chips, made of LED, light of its performance of this dissertation is divided into six chapters written.

Chapter 1 introduces the development process of white light diode, an overview of current white LED with a phosphor research and outlines the status of rare earth luminescent materials progress Finally elaborated on the basis of the dissertation topics and research content.

Chapter 2, high-temperature solid-prepared Eu ~ (3) ion-doped series Y_ (1-x) Eu_x (PO_3) _3 (0 ≤ x ≤ 1) red phosphor, characterized by XRD and fluorescence spectroscopy and its structure fluorescence properties were characterized. The results show that 600 ℃ ~ 900 ℃ temperature range, are eligible for a single Y (PO_3) _3, Eu (PO_3) _3 pure phase, we choose the conditions 800 ℃ calcined samples obtained, a detailed study of its photoluminescence properties , the results obtained when x = 1 when its strongest light.

Chapter 3 high-temperature solid-prepared Eu ~ (3) ion-doped BaCa_ (1-x) (PO_3) _4: xEu ~ (3) series of phosphors, and their synthesis and characterization based on the Li-ion doped ion research, preparation series BaCa_ (0.9-x) Eu_ (0.1) Li_x (PO_3) _4 red phosphor, and XRD and fluorescence spectra and fluorescence properties of its structure were characterized. The results show that in the pure phase obtained under the premise, BaCa_ (1-x) (PO_3) _4: xEu ~ (3) phosphor Eu ~ (3) when the doping concentration of 0.10 the highest light intensity, when the Li ~ doping concentration of 0.15, the phosphor BaCa0.75Eu0.1Li0.15 (PO_3) _4 maximum luminous intensity, and the co-doped by Li ~, in charge of compensation, but also to enhance the luminescence intensity of phosphor.

Chapter 4, the weak reducing atmosphere using CO were prepared by high temperature solid Eu ~ (2), Mn ~ (2) doped series Ba_ (1-x) EuxCa (PO_3) _4, Ba_ (0.85) Eu_90.15) Ca_ ( 1-x) Mn_x (PO_3) _4 phosphor, and studied their photoluminescence properties. The results show that the doped Eu ~ (2) of the Ba_ (1-x) Eu_xCa (PO_3) _4 as a pure phase of the phosphor of the premise, in this system with the Eu ~ (2) ion doping concentration increased, luminous intensity is increasing, when the doping concentration of 0.15, the strongest, no significant change in http://www.999magnet.com/products/131-magnetic-lifter excitation spectra. In Ba_ (0.85) Eu_ (0.15) Ca_ (1-x) Mn_x (PO_3) _4 system, with Mn ~ (2) ion concentration increased, the occurrence of energy transfer.

Chapter 5 examined the preparation of phosphors in the near UV InGaN-based white LED applications. The resulting performance will be better prepared monochrome phosphors Eu (PO_3) _3, BaCa_ (0.9) (PO_3) _4: 0.1Eu ~ (3), BaCa_ (0.75) Eu_ (0.1) Li_ (0.15) (PO_3) _4, respectively, at ~ 395 nm chip production with red LED.

Chapter 6 summarizes the main work of this dissertation, and in accordance with the progress and shortcomings, near-UV excitation of the future conversion of rare-earth phosphor-based LED research with a brief outlook.Degree Year: 2010