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Optical Materials, 2000, 15:143148致謝 首先，我要向董永軍和劉海蓮老師致以最衷心的感謝和最崇高的敬意。本論文是在董永軍和劉海蓮老師的悉心指導(dǎo)下完成的，老師嚴(yán)謹(jǐn)求實(shí)的學(xué)術(shù)態(tài)度，清晰活躍的學(xué)術(shù)思維，以及創(chuàng)新、求實(shí)的科研態(tài)度和精神，這些寶貴的財(cái)富將使我終生受益。在這個(gè)過程中，我受益最大的地方就是無論遇到什么困難，首先要敢于自己面對，樂觀積極，勤于思考，用于探索，培養(yǎng)獨(dú)立的學(xué)術(shù)專研能力。在此謹(jǐn)向兩位老師致以最衷心的感謝。其次感謝大學(xué)四年所有授課老師的辛勤教誨，老師對我們的學(xué)習(xí)生活都很關(guān)心，最重要的是用他們的實(shí)際行動教會了我很多道理。在此向老師致以最誠摯的感謝。還要感謝我的輔導(dǎo)員劉菲老師對我的生活和學(xué)習(xí)給了很大的幫助。最后我得感謝我的家人在大學(xué)4年里給我的支持和關(guān)心，沒有他們的付出就我沒有今天的畢業(yè)。附錄1英文原文Preparation and Optical Properties of Transparent Ce:YAG Ceramics for High Power White LEDS. Nishiura1, S. Tanabe 1, K. Fujioka2, Y. Fujimoto2 and M. Nakatsuka21 Graduate School of Human and Environmental Studies, Kyoto University,Yoshida nihonmatsucho, Sakyoku, Kyoto 6068501, Japan2 Institute of Laser Engineering, Osaka University, 26 Yamadaoka,Suita, Osaka 5650871, JapanEmail: @ Abstract. Transparent Ce:YAG ceramics were synthesized from the Ce:YAG powder which was produced by copreparation method of the hydroxides. The Ce:YAG ceramics exhibit a broad emission band peaked at 530 nm due to the 5d→4f transition of Ce3+. The transmittances of the samples obtained were 70 ~ 87 % at 800 nm. The absorption coefficient and emission intensity of Ce3+ were increased with the increase of the thickness. With increasing thickness of the sample, the color coordinates of the Ce:YAG ceramics under 465 nm LED excitation shifted from the blue region to the yellow region with passing nearby the theoretical white point. The highest value of luminous efficacy of the white LED was lm/W.1. Introduction White LEDs are now extensively spotlighted as general illumination as well as backlight of the liquid crystal display (LCD), car headlights and indicator light. The advantages of the LEDs are low electric consumption, high brightness and long lifetime [1]. The most mon method to make the white LEDs is bining of a blue LED and Ce:Y3Al5O12 (Yttrium Aluminum Garnet) (Ce:YAG) phosphor packed with organic resins [2]. The function of the Ce:YAG phosphor is to absorb the blue light emitted from the blue LED and converts it to yellow light. The phosphor has a broad band emission due to the 5d→4f transition of Ce3+. The bination of two lights of the transmitted blue light and the fluorescent yellow light makes white light. However, this white LED has a disadvantage of thermal degradation of organic resins, which is caused by heat generation of LED chip. As a result, it catches up with the degradation of luminous intensity and the change of emission color. In order to solve this problem, a new type white LED using a glass ceramic phosphor has been studied [35]. The merits of this inorganic material are excellent heatresistance pared with polymers,For the merits mentioned above, this approach using inorganic materials is useful for the white LED. To further enhance the performance of the white LEDs, it is important to develop new inorganic materials that have superior optical property than that of glass ceramic phosphor. We have interest in transparent polycrystalline ceramics that have been studied as laser and scintillator materials [6]. They have attracted a great attention because the optical property and the efficiency are parable or superior to those of single crystals. They have advantages of high homogeneity, optical transparency and thermal conductivity. The transparent polycrystalline ceramics have been fabricated by solid state reaction using the powder of the same chemic