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Synthesis and Photoluminescence Characteristics of the Full-color Phosphorescent Material

Author: YangLiu
Tutor: CaoLiXin
School: Ocean University of China
Course: Materials Physics and Chemistry
Keywords: Red long afterglow High temperature solid phase Visible light excitation Rhodamine B Sr3Al2O6: Eu3 Fluorine germanium and magnesium : manganese
CLC: TB34
Type: Master's thesis
Year: 2010
Downloads: 55
Quote: 0
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Abstract

The phosphorescent material called Afterglow Luminescent Materials, daytime able to absorb sunlight or ultraviolet light, and energy stored when the light stopped after irradiation able to store light energy released in the form of visible light materials. , Blue, green long afterglow materials has been the development of more mature, red Long Afterglow luminescence brightness and afterglow time, compared with the material properties of the two colors there is a big gap. Red long afterglow materials research has important theoretical significance and practical value. This topic intends to adopt a whole new way of thinking to prepare red long-lasting materials: the light emitted by the excellent performance of blue, green long afterglow phosphor as the excitation source, constantly stimulate red fluorescent material, so that it can continue emits red light, and thus indirectly red long-lasting material. The papers chosen an organic dye Rhodamine B, a high-temperature solid-phase synthesis of two inorganic materials Sr3Al2O6: of Eu3 and fluorine-germanium and magnesium: manganese as a red fluorescent material, study its luminescent properties and determine the sample preparation process route. Good selection afterglow violet (PLP-6), Blu-ray (PLB-8B) and yellow-green light (PLO-8B) long afterglow material with red material composite study the ratio of the afterglow of the performance of the composite. By free radical initiated bulk polymerization, to prepare a colorless, transparent, and good optical properties of the PMMA, with its mixed sample carrier. Luminescent properties of Rhodamine B by which the chemical environment in PMMA easily peak of 555nm yellow-green light excitation, emission peak at 580nm of orange-red shade. PMMA as a carrier, Rhodamine B (R) and the yellow-green long afterglow material the PLO-8B (G) of the mixed sample, in ordinary lamp under irradiation, after the light source is turned off, the naked eye can be observed to the obvious red afterglow. To change the ratio of R and G, the afterglow can be observed in different colors. The high-temperature solid phase prepared Sr3Al2O6: Eu3, can be visible light excitation and emission red. Linear emission peak at 392nm and 463nm excitation, can be attributed to the the Eu3 ions 5DJ (J = 0, 1, 2, 3) → 7FJ (J = 0, 1, 2, 3, 4, 5) transition to 612nm and 617nm near the corresponding strongest 5D0 → 7F2 electric dipole transition luminous. The afterglow of the sample itself, the effect is not obvious, the choice of blue, purple long afterglow phosphor Sr3Al2O6: Eu3 carried mixed, afterglow and improved performance of the initial light intensity increased persistence time has been extended. High-temperature solid phase prepared fluoride Germanium magnesium: manganese, its excitation band from 280nm extends to 440nm, with a high-intensity broadband excitation peak in the visible region can be blue, violet excited, emits 657nm for maximum The emission peaks of the five linear peak, which is generated by 2E → 4A2 transition Mn4 characterized emission peak. Sample itself almost does not have the ability of emitting afterglow, selection of blue (B), (V) and purple long afterglow material with fluorine germanium magnesium: Mn (S) is mixed, the mixed sample obtain better emitting red afterglow properties. Mixed sample as compared with pure afterglow material, and monitoring the wavelength of 657nm of the afterglow decay of both the light intensity there is obvious difference, while in the spectrum of afterglow can be observed to the clear red emission peak, which are strong in the graph. confirmed the subject of design ideas. The S and V with different quality than the compounding V Afterglow can not all be used to effectively stimulate the S, S the proportion of the rise, the more composite light color emitted by the mixed sample afterglow tends to purple zone the mass ratio of S: V is 9:1 about afterglow effect is ideal, the coordinate value of (0.2302,0.0492) in 1931CIE-xy chromaticity diagram.

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