| 研究生: |
陳鴻承 Hung-Cheng, Chen |
|---|---|
| 論文名稱: |
硫化鋅摻雜銩,錳系列螢光粉與薄膜之研製及其特性探討 The Preparations and Investigations of the characteristics of ZnS:Tm,Mn Phosphors and Thin films |
| 指導教授: |
朱聖緣
Chu, Sheng-Yuan |
| 學位類別: |
碩士 Master |
| 系所名稱: |
電機資訊學院 - 電機工程學系 Department of Electrical Engineering |
| 論文出版年: | 2006 |
| 畢業學年度: | 94 |
| 語文別: | 中文 |
| 論文頁數: | 127 |
| 中文關鍵詞: | 硫化鋅 、摻雜銩 錳 、薄膜 、螢光粉 |
| 外文關鍵詞: | thin films, phosphors, ZnS, doped Tm Mn |
| 相關次數: | 點閱:90 下載:4 |
| 分享至: |
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摘 要
硫化鋅(ZnS)具有寬能隙(為3.68eV)的特性,為Ⅱ-Ⅵ族化合物半導體成員,在商業上經常使用作為螢光粉,同時也應用在薄膜電激發光元件上。優異的發光特性,且可發出可見光使其適合作為螢光材料,主要的用途是在於照明光源、顯示器元件與光輻射偵測器等方面。近年來,由於日亞公司發明第一顆藍光LED後,進而再提出用InGaN LED發出的藍光去激發YAG:Ce+3螢光粉發出黃光和未吸收的藍光混成白光,白光固態照明自此引起產學界一股熱烈地鑽研探討。
本論文先探討ZnS:Mn及ZnS:Tm單一摻雜的發光特性。並利用RF-Sputter濺鍍成螢光薄膜,發現在摻雜錳1mol%、退火800℃時可得最佳發光表現,其PL光譜為一發射576nm橘黃光的波鋒,並經公式轉成C.I.E座標值為(0.50,0.48)。我們發現發光強度與XRD峰值強度呈正相關,與半高寬值呈負相關;粗糙度隨著退火溫度越高、摻雜量越多而變的越差;穿透度也是隨著退火溫度越高、摻雜量越多而變的越差,且因錳摻雜不同、退火溫度不同時能隙(band gap)會有所改變,隨著摻雜量增加能隙隨之增加,但摻雜3mol%時則又變小;隨著退火溫度增加能隙隨之增加。
ZnS:Tm螢光粉在氬氣氣氛下或真空下(~10-1)皆以摻雜2mol%、持溫3hr有最佳的發光表現,在氬氣氣氛下其PL光譜為一發射472nm藍光的窄波鋒,並經公式轉成C.I.E座標值為(0.24,0.25);在真空下其PL光譜為一發射約500nm藍綠光的寬波鋒,並經公式轉成C.I.E座標值為(0.21,0.32)。真空下煆燒時發光會紅移成藍綠光,但有較佳的發光相對強度表現。
由於日亞公司混成白光方法須作波長轉換而造成能量損失,因此本論文利用ZnS:Mn+Tm co-doping方式(ZnS發450nm藍光、Mn發576nm橘黃光、Tm發472nm藍綠光)混成白光,不同的是其不用作波長的轉換,不會造成太多的能量損失。且本論文朝螢光粉及薄膜兩方向進行,ZnS:Mn+Tm螢光粉在氬氣氣氛下或真空下(~10-1)皆以铥摻雜2mol%、錳摻雜0.075mol%時較符合混成白光的條件。在氬氣氣氛下其PL光譜為一發射470nm藍光的波鋒與583nm橘黃光的波峰,並經公式轉成C.I.E座標值為(0.31,0.31);在真空下其PL光譜與在氬氣氣氛下相差不多,並經公式轉成C.I.E座標值為(0.32,0.31)。且在真空下煆燒有較佳的發光相對強度表現。
Abstract
Zinc sulfide (ZnS), as II-VI semiconductors with a wide band gap energy of 3.68eV,have received much attention due to their excellent luminescence properties and commercially used as phosphors applicated in electroluminescence devices. They are candidate materials for phosphors that emit visible light. The major and important applications of phosphors are used as light sources, display devices, radiation detectors and so on. Recently , the first of blue LED is patented by Nichia Chemical and then they use blue InGaN-based LED to excite YAG:Ce3+-based phosphor, the yellow light emitting from the phosphor and the residual blue light produce the white light. Hence,solid white light sources are studied by industry and academia avidly.
Firstly , this report studies the luminescence of ZnS:Mn film and ZnS:Tm phosphors separately. ZnS:Mn film is deposited by the RF-magnetron sputtering system. We find the best of the luminescence is on Mn doping 1 mol%、annealing at 800℃. The PL of ZnS:Mn film results in the orange-yellow emission peaked at 576nm, and C.I.E(0.50,0.48)is obtained by the PL spectrum. We also find the intensity of the luminescence has a direct ratio with the intensity of XRD and has an inverse ratio with the FWHM;The roughness and the transmittance become the worse with the higher anneal temperature and the more dope. The band gap changes in the different of anneal temperature and dope;The band gap becomes large with the more dope and the higher anneal temperature, but it becomes small on Mn doping 3mol%.
ZnS:Tm phosphor has the best of the luminescence in Ar or in vacuum(~10-1 atm) is on Tm doping 2mol%、sintering 3 hr. In Ar, the PL of ZnS:Tm phosphor results in the narrow blue emission peaked at 472nm, and C.I.E(0.24,0.25)is obtained by the PL spectrum;In vacuum, the PL of ZnS:Tm phosphor results in the wide blue-green emission peaked at 500nm, and C.I.E is(0.21,0.32). Although the luminescence red shifts to blue-green emission in vacuum, it is better in vacuum.
The approache patented by Nichia Chemical is limited due to wavelength conversion of the injected photon. So this report present a method through co-doping ZnS:Mn+Tm(ZnS emites 450nm blue light、Tm emites 472nm blue light、Mn emites 580nm yellow light )to produce the white light. But it takes little loss of energy because of no wavelength conversion of the injected photon. ZnS:Mn+Tm phosphor which is agreeable to the condition of white light in Ar or in vacuum(~10-1 atm) is on Tm doping 2mol%、Mn doping 0.075mol%. In Ar, the PL of ZnS:Mn+Tm phosphor results in the blue emission peaked at 470nm and the orange-yellow emission peaked at 583nm , and C.I.E(0.31,0.31)is obtained by the PL spectrum;In vacuum, the PL of ZnS:Mn+Tm phosphor results in the same emission , and C.I.E is(0.32,0.31). And the luminescence is better in vacuum.
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