提升具有次波長金屬光柵之偏極化白光LED的光學品質｜國立臺灣科技大學博碩士論文系統

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研究生：	林瓘洆 Guan-Cheng Lin
論文名稱：	提升具有次波長金屬光柵之偏極化白光LED的光學品質 Improve the Optical Characteristics of Polarized White Light Emitting Diodes with a Nano-wire Grid Polarizer
指導教授：	蘇忠傑 Jung-chieh Su
口試委員:	葉秉慧 Pinghui-sophia Yeh 林保宏 Pao-hung Lin 楊恆隆 Heng-long Yang
學位類別：	碩士 Master
系所名稱：	電資學院 - 光電工程研究所 Graduate Institute of Electro-Optical Engineering
論文出版年：	2013
畢業學年度：	101
語文別：	中文
論文頁數：	185
中文關鍵詞：	偏極化白光LED 、次波長金屬光柵、粒子散射、表面散射、偏極隨機化機制
外文關鍵詞：	Polarized white LED, Nano-wire grid polarizer, Particle scattering, Surface Scattering, Polarizing randomization mechanism
相關次數：	點閱：288 下載：3
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含有次波長金屬光柵的偏極化白光LED擁有許多優點，如高消光比的偏極性、低色差和質輕密集等優點，因此在照明領域上可有效降低眩光的產生且有取代LCD面板之下偏光片的淺力。但因為次波長金屬光柵中的鋁金屬有吸收可見光之現象，侷限其穿透率之大小，影響了偏極化白光LED之發光效率，因此在不改變光柵結構的情況下，提升光柵的穿透率為本實驗之研究目標。
為了尋找提升光柵穿透率之方法，本研究量測不同表面微結構之螢光片的偏極散射光型，發現藉由粒子散射和螢光粉波長轉換效應可有效提升螢光層的偏極隨機化機制，而偏極隨機化機制有助於增加次波長金屬光柵的穿透率。
根據螢光片的量測結果，將摻雜氧化鋅奈米粉粒的之奈米膠添加於偏極化白光LED的螢光層上，增加螢光層的粒子散射和螢光粉的波長轉換效應來提升其偏極隨機化機制，有效提升偏極化白光LED之次波長金屬光柵的穿透率，在添加奈米膠濃度為11%時，最高提升原本的4.58%，但其發光效率在添加奈米膠濃度為7%時最高，提升了原本的4.98%，而此時的穿透率增加了原本的2.92%，由此可知添加奈米膠確實可增加螢光層的偏極隨機化機制來提升次波長金屬光柵之穿透率，增強了偏極化白光LED的發光效率，使具有次波長金屬光柵的偏極化白光LED更具競爭力。

The PWLED(Polarized white light-emitting-diode) which packaged with NWGP(Nano-wire grid polarizer) can generate polarized light with high ER(Extinction ratio), improving the problem of the glare in interior lighting and automobile lighting, and having better stability of color performance at different viewing angles and currents than traditional WLED. Because of NWGP’s high ER and the absorption-loss of the metal material, the transmittance of NWGP is limited.
In experiment, we realized that scattering and down-conversion of phosphors dominate the PRM(Polarization randomized mechanism) instead of micro-structural surfaces by measuring the PSDF(Polarized scattering distribution function) of phosphor layer in different structural surfaces. So we decide to add the nano-particle resin to the PWLED package for increasing the transmittance of NWGP by promoting the PRP.
In terms of same CCT, the transmittance and luminous efficiency of the PWLED which add the nano-particle resin are 0.76% and 0.21 lm/W more than the PWLED which only has phosphor resin. In terms of different CCT, transmittance gain increases with the increase of concentration of nano-particle resin, but the luminous efficiency gain has a maximum in 7% of nano-particle resin is 1.0498, and the transmittance gain is 1.0292 .
No matter the CCT of PWLED is changed after adding the nano-particles resin or not, the transmittance of NWGP, luminous efficiency and stability of color performance at different viewing angles and currents will all increase. We can only adjust the concentration of nano-particles resin to get different CCT of PWLED which supply the needs of different applications, enhance the competitiveness of PWLED.

第一章 導論...........................................1
1 前言.............................................1
2 文獻回顧..........................................2
2.1 偏極化白光LED...................................2
2.2 粒子散射理論與散射光之偏振特性......................6
2.3 偏振光用於表面結構與散射介質的量測..................11
3 論文架構.........................................19
第二章 研究目的與方法..................................20
1 研究目的.........................................20
2 量測架構與儀器....................................21
2.1掃描式電子顯微鏡..................................21
2.2光型特性量測.....................................21
2.2.1 螢光片基本特性量測.............................22
2.2.2 菲涅耳(Fresnel)反射量測........................23
2.2.3 正向與逆向偏極散射光型量測.......................24
2.2.4  LED光場量測..................................25
2.2.5  LED偏極性量測................................26
2.3 積分球與I-V電性量測..............................27
3 螢光層之材料特性與製作..............................29
3.1 螢光層之材料特性.................................30
3.2 螢光片之製作....................................32
3.3 螢光片之表面結構與散射能力.........................34
4 白光發光二極體封裝..................................37
4.1 封裝流程........................................37
4.2 矽膠層之厚度優化.................................38
第三章 螢光層特性量測...................................40
1 前言.............................................40
2 平面螢光層........................................42
2.1 放射光譜與波長、偏陣之相依性.......................42
2.2  TM/TE Fresnel 反射量測.........................47
2.3 偏極散射光型....................................53
2.4 整理...........................................63
3 表面粗化螢光片.....................................66
3.1 偏極散射光型.....................................66
3.2 整理............................................79
4 比較與討論.........................................80
4.1 不同結構對偏極散射光型之影響........................80
4.2 偏極隨機化機制之分析...............................82
第四張 偏極隨機化白光LED之效能優化.........................89
1 偏極化白光LED封裝結構................................89
2傳統白光LED結合次波長金屬光柵...........................91
2.1 螢光膠之配方優化...................................91
2.2 不同視角特性量測...................................94
2.3 不同電流特性量測...................................98
3 奈米膠添加白光LED結合次波長金屬光柵.....................104
3.1 奈米粉之去極化效應驗證..............................104
3.2 不同奈米膠濃度對WLED/PWLED之影響....................107
3.2.1 不同奈米膠濃度之WLED/PWLED的光學品質...............107
3.2.2 不同視角特性量測..................................111
3.2.3 不同電流特性量測..................................118
3.3 有無奈米膠在同色溫下對WLED/PWLED之影響................123
3.3.1 同色溫下螢光膠之配方優化............................123
3.3.2 不同視角特性量測..................................126
3.3.3 不同電流特性量測..................................133
4 比較與討論...........................................138
4.1 奈米膠的濃度對WLED/PWLED之影響.......................138
4.2 奈米膠的有無對WLED/PWLED之影響.......................139
第五章 結論與未來展望......................................140
1 結論.................................................140
2 未來發展方向..........................................143
參考文獻.................................................144
附錄A....................................................147
附錄B....................................................152
附錄C....................................................171

                                

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