以液晶元件作為光學調制器並實現其增強光電性能上的應用

黃久菖

doi:10.6342/NTU.2015.02223

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以液晶元件作為光學調制器並實現其增強光電性能上的應用

Liquid Crystal Devices as Modulators for Applications of Optoelectronic Performance Enhancement

黃久菖 , Ph.D　　Advisor：趙治宇　　

英文 DOI： 10.6342/NTU.2015.02223

液晶；白光發光二極體；可變色溫；照明設計；膽固醇型液晶；硒化鎘奈米棒；光致螢光；缺陷線； liquid crystal ； white light-emitting diode ； tunable color temperature ； illumination design ； cholesteric liquid crystal ； CdSe nanorod ； photoluminescence ； disclination

Abstract │ Reference (71) │ Times Cited (1) │ Altmetrics

Abstract 〈TOP〉

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Liquid crystals (LCs) are well known materials which are widely utilized in the region of displays. Their various unique optical properties of LC molecules, which are resulted from different orientations, make them potentially applicable to diverse applications other than displays. In this dissertation, we have successfully applied LCs to two different regions: illumination and optical enhancement with two different kinds of LCs, nematic and cholesteric LCs, being used respectively. The results have shown that the LCs not only possess high capability of application in these regions but also exhibit comparable efficiencies to the methods generally used. Additionally, it brings benefits of simple integration and operation which do save more efforts and costs.
In the application of illumination, 90° twist nematic LCs are used to fabricate a transmittance controllable device. Combining with blue light-emitting diodes (LEDs) and a patterned phosphor layer, we construct a correlated color temperature (CCT) tunable white light LED. The variation of CCT of this white LED passes through ANSI white quadrangles on chromaticity diagram, which can even be finely adjusted to the black body locus. Moreover, the manner of the variation of CCT can be regulated. With proper replacement of blue LED and phosphor, we fabricated a white LED with variable CCT ranged from 3700 K to 6100 K for track close to black body locus. Different from commercially CCT-tunable white LEDs, this approach not only provides a simple way to design, construct and manipulate a CCT variable LED, but with applying well developed LC technologies, the performance of white LEDs can also be modulated and improved. Additionally, with the utilization of transmittance adjustment of the blue light, the problem of blue hazard of white LED which many users worry about can be solved as well.
In the application of optical enhancement, we have doped cadmium selenide (CdSe) nanorods into cholesteric LC (CLC) cells. The constructed cells filled with three different kinds of CLCs generally show an amplified photoluminescence (PL) phenomenon. The spectra also reveal that the efficiency of amplification is related to the optical pitch of CLCs. It displays an inversely proportional property, that is, a greater enhancement of the PL signal is achieved in the samples with shorter pitch length of CLCs. The highest PL amplification acquired in this study is 4.27-fold which is much higher than the traditional method of surface plasma resonance. The analyses have shown that the enhancement phenomenon is attributed to the presence of oily streaks in CLCs which possess optical properties benefiting the excitation of CdSe nanorods. Different from the traditional method, this simple method can enhance the PL signal efficiently without damaging the materials or interfering in the signals. Moreover, with versatile properties that CLC possessed, this study suggests that the method could provide a potential way for PL signal manipulation in many optical fields.

Reference ( 71 ) 〈TOP〉

References of Chapter 1
連結：
1. P. Yeh and C. Gu, Optics of Liquid Crystal Displays (John Wiley & Sons, Inc., USA, 1999).
連結：
2. R. K. Pathria, Statistical Mechanics (Elsevier Pte Ltd.,Singapore, 2006).
連結：
3. P. G. de Gennes, Nobel Lecture in Physics in 1991.
連結：
4. G. Stojmenovik, Ion Transport and Boundary Image Retention in Nematic Liquid Crystal Displays (Universiteit Gent, Gent, 2004).
連結：

Times Cited (1) 〈TOP〉

周祖銳(2017)。利用摻雜及後處理技術製作高導電PEDOT:PSS膜用於液晶顯示器。臺灣大學物理學研究所學位論文。2017。1-100。

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