【正文】 能、應(yīng)用范圍的不同，光致發(fā)光材料又分為長(zhǎng)余輝發(fā)光材料、燈用發(fā)光材料和多光子發(fā)光材料等。 助熔劑是當(dāng)有的發(fā)光材料合成溫度很高時(shí)，為了降低溫度，達(dá)到節(jié)能、節(jié)時(shí)、降低成本的目的，人們?cè)诎l(fā)光材料當(dāng)中添加的另外一種雜質(zhì)。在具有一種激活離子的發(fā)光材料當(dāng)中，激活離子起發(fā)光中心的作用，它與基質(zhì)晶格或本身離子之間可能存在著能量傳遞的作用；在具有兩種以上激活離子的發(fā)光材料中，有的激活離子可能并不起到發(fā)光的作用，僅起能量傳遞的作用，將能量通過(guò)自身離子傳遞給另一種離子，起到增強(qiáng)發(fā)光亮度、延長(zhǎng)余輝時(shí)間的作用，這種離子被稱為敏化劑 ，又稱輔助激活劑 。在有的發(fā)光材料中，基質(zhì)僅僅是起到禁錮激活離子的作用，有的基質(zhì)同時(shí)發(fā)揮禁錮激活離子和吸收能量?jī)煞N作用。 關(guān)鍵詞： Sr3Al2O6，紅色長(zhǎng)余輝，溶膠凝膠法，發(fā)光機(jī)理 太原理工大學(xué)碩士研究生學(xué)位論文 III RESEARCHES ON SYNTHESIS AND PHOTOLUMINESCENCE OF THE RED LONG PERSISTENT PHOSPHORS SR3AL2O6:EU2+ BY SOLGEL ABSTRACT The long photoluminescence phosphor is a new functional material that can illuminate for a long time after the lamphouse is closed. This material has been applied in lots of domains such as emergent illumination, military affairs, industrial arts etc. Its application is restrained by the deficiency of the red long photoluminescence phosphor. Now the research on the new red long photoluminescence phosphors has been done and the Sr3Al2O6:Eu2+ phosphor has been thought much of because this phosphor possesses the excellent characteristics of the aluminates. In this paper, strontium aluminates phosphors were prepared by a new method of solgel process in order to research and develop a sort of cheap, environmental friend and highefficient red long afterglow phosphors materials. Using Sr3Al2O6 as matrix, Eu2O3 and Dy2O3 as codoping agent, a long afterglow luminescent material Sr3Al2O6:Eu2+, Dy3+ was prepared by solgel method. Its excitation and emission peak lie in 473 nm and 612 太原理工大學(xué)碩士研究生學(xué)位論文 IV nm respectively, and the afterglow can last about 10 minutes (≥mcd/m2). Through the parison experiment, the optimal experiment condition for preparing Sr3Al2O6:Eu2+,Dy3+ was obtained as follows: the nominal position is :+,+, the sintering temperature is 1200℃ , the temperature retention time is 2 hours, the heating rates is 56 ℃ /min, the flux is H3BO3 (adding amount of Al (mole ratio)). The XRD, excitation spectrum, emission spectrum and afterglow decay curve were used to characterize Sr3Al2O6:Eu2+,Dy3+ in this thesis, and the influences of sintering temperature, adding amount of H3BO3, concentration of doped Eu3+, concentration of doped Dy3+, concentration of doped Pr3+, and heating rate on the luminescence properties of Sr3Al2O6:Eu2+, Dy3+, have been applied to an elementary understanding on synthesis process of phosphors, characteristic of spectra and fluorescent properties. The mechanism of the Sr3Al2O6:Eu2+,Dy3+ phosphors exhibit red long afterglow luminescence after excited by visible light was analyzed. The effect of the crystal field causes the split of 5d energy level of Eu is larger than that of SrA12O4 phase. The effect of the nephelauxetic causes the center of gravity of the 5d excited state energy levels reduced. Resulting in the excitation spectrum of Sr3Al2O6:Eu2+ Long Afterglow Phosphors extend to the longwave direction, led to red shift of the photoluminescence spectra of Sr3Al2O6:Eu2+. The broad red emission 太原理工大學(xué)碩士研究生學(xué)位論文 V band with the peak located at 612 nm. It was found that the influence factors of preparing the strontium aluminates solgel were the pH value of solution, additive categories, the concentration of solution, the heating temperature and so on. The addition of ethanol in preparing sol can adjust pH value in preparing solgel. The experiment during was shorten greatly. It is discovered that the emission intensity of phosphors increased firstly then decreased with the content of Eu2+ ions. The quenching concentration of the Eu2+ ions is 2 mol% and the quenching mechanism is proved as dipoledipole interaction. The effect of H3BO3 on the Sr3Al2O6:Eu2+,Dy3+ phosphor was also investigated. It is showed that B3+ ions can increase the intensity of the luminescence and improve the long afterglow performance of Sr3Al2O6:Eu2+,Dy3+ phosphor. When added B3+ the best luminescent properties of Sr3Al2O6:Eu2+, Dy3+ was obtained. KEY WORDS: Sr3Al2O6, red long afterglow, solgel, luminescence mechanism 太原理工大學(xué)碩士研究生學(xué)位論文 1 目 錄 摘 要 ................................................................................................................................I ABSTRACT................................................................................................................... III 第一章 緒論 .................................................................................................................... 1 長(zhǎng)余輝發(fā)光材料概述 ........................................................................................... 1 紅色長(zhǎng)余輝發(fā)光材料研究現(xiàn)狀 ............................................................................. 2 硫化物體系 ............................................................................................... 2 硫氧化物體系 ............................................................................................ 4 鈦酸鹽體系 ............................................................................................... 5 硅酸鹽體系 ............................................................................................... 6 鋁酸 鹽體系 ............................................................................................... 8 紅色長(zhǎng)余輝發(fā)光材料的主要合成方法 .................................................................. 9 高溫固相法 ............................................................................................. 10 溶膠凝膠法 ............................................................................................. 10 燃燒法 .....................................................................................................11 共沉淀法 ..................................................................................................11 其他方法 ..................................................................................................11 紅色長(zhǎng)余輝發(fā)光機(jī)理研究現(xiàn)狀 .....................