研究生: |
陳柏諱 BO-HUI CHEN |
---|---|
論文名稱: |
光譜可調之螢光轉換發光二極體光源 Emission Spectrum Tunable Phosphor-Converted Light Emitting Diode Light Sources |
指導教授: |
蘇忠傑
Jung-Chieh Su |
口試委員: |
葉秉慧
Pinghui Sophia Yeh 楊恆隆 none 林保宏 Pao-hung Lin |
學位類別: |
碩士 Master |
系所名稱: |
電資學院 - 電子工程系 Department of Electronic and Computer Engineering |
論文出版年: | 2016 |
畢業學年度: | 104 |
語文別: | 中文 |
論文頁數: | 161 |
中文關鍵詞: | 螢光粉 、田口式實驗法 、植物燈 |
外文關鍵詞: | Phosphors, Taguchi method, Plant light |
相關次數: | 點閱:597 下載:1 |
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因為植物在不同的生長時期所需要的光譜不同,而植物工廠所用的光源是由不同數量的藍光與紅光LED所組成,所以植物生長燈是無法滿足植物所需要的光譜。本實驗利用多波長及多螢光粉的LED封裝結構來達到改變光譜特性的目的,以達到單顆LED就可以對植物不同生長時期提供相對應之光譜。本研究分為三個部分,第一部分螢光粉效率,計算各晶粒發光波長對不同螢光粉及其組合的能量轉換效率,並找出符合對植物所需光源的最佳效率之配方,而螢光粉能量轉換特徵分為波長轉換之量子效率及斯托克斯位移損耗,另外螢光粉之間的交互作用也需加入探討,以求得最佳效率組合,作為所需光源的螢光粉種類及晶粒波長之選擇參考基準。
第二部分為田口式實驗法,此方法作為各波長晶粒與螢光粉之最佳效率組合實驗的設計工具,第一次田口式目的為降低變異誤差(信號雜訊比),第二次田口式實驗目的為提高目標值平均,進而找出螢光粉最佳濃度配方。
第三部分為討論最佳螢光粉濃度配方的LED光質特性,其探討可分為三點結論,(一)紅色與藍色是植物行光合作用最有效的波長,依照不同的生長時期來調整不同的植物種類其需求紅光和藍光比例;(二)光譜相對強度的分佈可讓植物所具有的不同植化素吸收;(三)光譜半高寬的變化可讓植物吸收光譜有不同的吸收比例,造成對植物的生長狀態的影響,此外在照明應用方面,不同的發光光譜的半高寬變化對光譜的演色性會有提升效果。
Since plants needed different spectrum in different growth stages, the light sources of plant factory are composed of various number of blue or red LED, therefore the light source of plant factory is unable to satisfy the spec¬trum needed of the plant growth. In this study, the use of multi-wavelength excited multi-phosphor for LED packaging structure to achieve the pur¬pose of changing the emission spectral characteristics of a single LED, this re-search is proposed to provide the spectrum corresponding to different stages for plants growth.
To find the best recipe of light source required, this study is divided into three parts, the first part is phosphor effi¬ciency analysis, calculating energy conversion efficiencies at the emission wave¬length of each LED die of dif-ferent phosphors and their combinations.
The en¬ergy conversion characteristics of phosphor is divided into the wavelength conversion efficiency and Stokes shift loss, in addition, the inter-action between phos¬phors which can provide a criterior for the optimized combina¬tion of efficiency need.
The second part is the Taguchi method analysis, this method acts a de-sign tools for choice of the combination of LED exciting wavelength and phosphors, the first purpose of Taguchi is to reduce varia¬tion, the second purpose is improve to target average, also use of Taguchi method can be used to find the optimal formula¬tions of phosphors concentration.
The third part is to discuss LED light characteristic of the optimized phosphors concentration formulations, which can be divided into three con-clusions, 1.Red and blue are the most effective wavelengths for plant photo-synthesis, according to the different periods for plant growth and the different plants, therefore, the ratio between red and blue will be also different; 2.The spectrum distribution of the relative strength enables plants different phyto-chemical to absorb; 3. The full width at half maximum (FWHM) of the LED emission spectrum changes the plant absorption spectrum result in different absorption ratio for various growth state, in addition to the illumination ap-plication, the FWHM of the emission spectrum also improved color rendering characteristics.
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