- 學位論文
以液態介質與奈米結構應用於暖光照明及高再現性感測器之研究
Applications of Liquid Medium and Nano-structures on Warm Lighting Device and Highly Reproducible Sensor
摘要
本論文將針對液態介質與奈米結構在光電元件相關的應用進行探討。其中一種為暖白光LED照明，另一種為拉曼光譜感測器，而目的皆為嘗試利用液態介質的高分散性與均勻性來達成高效率的應用，以及考慮其各自應用上的需求，設計出最佳化的奈米結構。 在暖光照明元件部分，我們將利用雷射染料在液態介質的高穩定性及高量子產率優勢，以其作為螢光轉換層，嘗試開發出暖白光照明的裝置，首先分析其吸收行為勝過許多其他應用於螢光轉換層的材料，再評估其作為螢光轉換層時，可達成的照明品質，研究中用了多種染料，探討其單一或同時使用時能達成的表現，亦探討了穩定度及發光效率等重要指標，發現其演色性表現最高可達91.2，並維持低於3000K的暖色表現，有相當潛力開發高照明品質的暖光照明元件。 此外，本論文也從奈米結構的角度著手，主要利用了奈米共振腔在寬波段的電場增益特性來開發寬波段的發光元件，並也利用同具增益效果的金屬奈米粒子來作比較，發現兩者皆可增益發光，而最佳化的奈米共振腔更可同時調控顏色來達成高照明品質，只需利用單一發光材料即可使一般光致發光元件難以提升的紅光品質有相當的提升，最後更探討了Tamm電漿膜堆結構具有突破奈米共振腔在此議題應用時限制的潛力。 在拉曼光譜感測器部份，不同於以往表面增強拉曼散射著重於測定乾掉之樣品，將以液態樣品作為應用目標，嘗試開發出最適合的高電場能量密度增益結構，並以具應用價值的微流道作為主要設計考量，分析並比較了多種奈米結構，最後發現Ｖ型凹槽結構針對景深而設計的空間搭配銀奈米粒子的高熱點，對R6G溶液的定量極限可達10-6M，偵測極限可達10-7M，在光點大小及景深範圍內的液體中只有約接近18個平均分子數，具有高再現性感測器的應用潛力。
並列摘要
In this thesis, we study two types of optoelectronic application: one is warm white light-emitting diode (WLED) lighting and the other is Raman spectroscopy. In both of which, we take advantage of the high dispersion and uniformity of liquid medium for the purpose of high efficiency, and design the optimized nanostructures according to their requirements when being applied with. In the first part, by taking advantage of the high stability and quantum yield of laser dyes in liquid medium, we tried to use them as the conversion layers so as to study the warm white lighting device. The absorptive properties were firstly studied and found that is better than many other photoluminescent materials, and the lighting quality was evaluated when making the laser dye solution as the conversion layers. Several types of dye were used either as individual or as mixed to explore the potential performance, and some important criterions such as stability and Luminous efficacy are also studied. The highest color-rendering index (CRI) potentially achieved is 91.2 when the correlated color temperature (CCT) is kept warm as 3000K below, which indicates its high potential for the development of high quality warm lighting device. In the second part, nanocavity was applied to study the device with broadband emission through the characteristics of high electric field in broad spectral regime, and metal nanoparticles for the enhancing effect were also studied for the comparison. Both of which are found to enhance the intensity of photoluminescence, and the optimized nanocavity can specifically tune the color to improve lighting quality simultaneously. It indicates that only one type of photoluminescent material is needed to improve the lighting quality of red, which is difficult to achieve in the previos literature. We also study the Tamm plasmonic structures to overcome the limitation of nanocavity, which is also a potential technique for the development of high quality warm lighting device. In the third part, in contrast to the previous surface-enhanced Raman spectroscopy (SERS) studies that primarily focused on the analysis of samples in dried state, we aim at the sample in liquid state and try to find out the most suitable nano-structure with high electric field intensity by considering the nano-fluidic channel-based design, which is a promising approach of application. We studied several types of nanostructures for comparison and found that the V-groove structure designed according to depth of focus (DOF) combined with silver nanoparticles (AgNPs) that have high density of hot spots can achieve the limit of quantification low as 10-6M and the limit of detection down to 10-7M, there are only ca. 18 moleculars in the effective detection area of liquid as considering the spot size and DOF of the system, which indicates the great potential to apply the liquid state sensor with high sensitivity and reproducibility.
參考文獻
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