用ceyag陶瓷材料制備高功率白光led及其光學(xué)性能研究畢業(yè)論文外文翻譯-閱讀頁(yè)
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【正文】 cubic structure, it is easy to fabricate the transparent polycrystalline ceramics of the YAG crystal with high transparency in parison with that of some crystals having other crystal symmetry. The coprecipitation method was used for synthesis of the YAG powder. We also measured the optical properties such as optical transmittance, photon distribution spectrum of total flux, color coordinates,luminous efficacy and luminous intensity under blue LED excitation.2. Experimental. Synthesis of Ce:YAG ceramics Y(NO3)36H2O, Al(NO3)36H2O were used as the starting materials. They were dissolved in distilled water with a stoichiometric ratio for Y:Al:Ce of (:5:). The total ion concentration was adjusted at about mol/l. In the coprecipitation method, the precursor precipitate was produced by adding a NH4HCO3 solution of mol/l at a speed of 10 ml/min in a beaker under mild stirring at 35 186。C for 12 h and at 200 186。C for 100 h in air to remove the organicsubstances. The powders were heated at 1200 186。C for 00 h under O2 atmosphere. Finally, it was heated at 1780 186。 Vis. Env. 22 1[3] Tanabe S, Fujita S, Sakamoto A and Yamamoto S 2006 Ceram. Trans. 173 19[4] Fujita S, Sakamoto A and Tanabe S 2008 IEEE J. Sel. Top. Quantum Electron. 14 1387[5] Nishiura S and Tanabe S 2008 J. Ceram. Soc. Jpn. 116 1096[6] Ikesue A and Kinoshita T 1995 J. Am. Ceram. Soc. 78 1033[7] Li J G, Ikegami T, Lee J H, Mori T, Yajima Y 2000 J. Eur. Ceram. Soc. 20 2395[8] Malacara D 2002 Color Vision and Colorimetry:Theory and applications (WA, USA: SPIE Press) pp 4975附錄2英文譯文用Ce:YAG陶瓷材料制備高功率白光LED及其光學(xué)性能研究吉田撤趙1 ，山田奧卡河21人類(lèi)和環(huán)境研究院,京都大學(xué), 2激光工程研究所,大阪大學(xué)Email: 摘要： Ce:YAG陶瓷由Ce:YAG粉末加工合成,Ce3+離子從5 d→4 f躍遷激發(fā)光譜表現(xiàn)為峰值為530nm的寬峰。 lm / W。實(shí)現(xiàn)白光LED的最普片方法是藍(lán)色LED芯片和可被藍(lán)光有效激發(fā)的發(fā)黃光熒光粉、玻璃陶瓷或單晶等熒光材料結(jié)合組成白光 LED[2]。然而隨著LED的溫度升高，其發(fā)光強(qiáng)度及顏色會(huì)退化，這是白光LED的一大缺點(diǎn)。為了進(jìn)一步提高白色發(fā)光二極管的性能,最重要的是要制定出新的無(wú)機(jī)材和有優(yōu)越的光學(xué)性質(zhì)的玻璃陶瓷熒光材料。其與用固態(tài)反應(yīng)法制造多晶陶瓷材料具有相同的化學(xué)成分。Ce:YAG晶體是立方結(jié)構(gòu)，并且很容易制造出透明的對(duì)稱(chēng)性很好的該晶體，非常適合用于白光LED的制造。2. 實(shí)驗(yàn) Ce:YAG陶瓷材料的合成Y(NO3)39H2O and Ce(NO3)3 mol/l NH4HCO3 在10 ml/。 得到Ce:YAG陶瓷熒光粉。在這個(gè)過(guò)程中乙醇,分散劑(Kyoeisha化工有限公司,Flowlen g 700)和二氧化硅添加到粉的重量比為粉:乙醇(1:5), wt % wt %的粉。結(jié)塊后，將泥漿置于氧氣環(huán)境下，800。C真空環(huán)境加熱20小時(shí)。表面被拋光的樣品用測(cè)量范圍200850nm分光光度計(jì)(日本島津公司集團(tuán),uv 3600)。在光學(xué)性質(zhì)測(cè)試時(shí)，將陶瓷材料放在上述LED上，積分球用光纖連接到CCD探測(cè)器進(jìn)行光譜能量和光子分布的總輻射通量的PL光譜測(cè)量積分球(Labsphere,Inc .,lms 100)，并用一個(gè)標(biāo)準(zhǔn)鹵素?zé)?Labsphere,Inc .,cls 600)來(lái)校準(zhǔn)這個(gè)測(cè)量系統(tǒng)，Ce:YAG陶瓷材料的發(fā)光功率通過(guò)LED的光譜功率計(jì)算出，Ce:YAG陶瓷材料發(fā)光強(qiáng)度和顏色坐標(biāo)(x,y）通過(guò)標(biāo)準(zhǔn)光譜測(cè)得。Ce:YAG陶瓷光學(xué)透射率是圖2所示，所有樣品在800nm光照下為7080%，吸收率與材料厚度成正比，5Ce3+， d ← 4f吸收光能。隨著樣品厚度的增加激發(fā)和輻射的色坐標(biāo)從藍(lán)光區(qū)域到黃光區(qū)域變化明顯。 lm/W 降到 44 lm/W， lm/W,這些數(shù)據(jù)與白光LED相匹配，Ce:YAG陶瓷材料未來(lái)是制造白光LED的理想材料。 lm/W，與商業(yè)白光LED相匹配，可見(jiàn)該材料是理想的白光LED材料。 參考文獻(xiàn)[1] Nakamura S and Fasol G 1997 The Blue Laser Diode (Berlin, Germany: Springer) pp 216 221[2] Bando K, Sakano K, Noguchi Y and Shimizu Y 1998 J. Light a
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