1,721,479 research outputs found
Investigation of Microcavity Effects and Surface Plasmon Polaritons in Organic Electro-Optical Devices
No full text在本論文中，首先是對非等向性及等向性發光材料所組成的有機發光元件結構建構光學模型並模擬其發光特性。並製作了分別具有非等向性及等向性光學特性的發光元件，量測發光頻譜，並與理論計算的結果相比較，發現相當吻合，因而確定該模型的有效性。
接下來我們分析了堆疊串接式白光有機發光元件(紅光+綠光+藍光堆疊串接式、雙色光+單色光堆疊串接式以及白光+白光堆疊串接式)的發光特性，結果發現雙色光+單色光堆疊串接式結構有著較好的色彩穩定度。
此外，我們針對不同氧化銦錫厚度的弱微共振腔有機發光元件結構進行理論計算及實驗研究，發現改變氧化銦錫厚度會使得元件效率有顯著的變化(1.34倍量子效率、1.44倍電流效率以及1.51倍功率效率之變化)。
另外，我們在厚度減薄的金屬電極上製作適當的吸光/再放光層，能夠將部分侷限在有機發光元件內的表面電漿子，藉由能量轉移機制而再放光。這種方法可用於實現具有光色可調性的雙面異色有機發光元件。
緊接著，我們對於金屬奈米顆粒的光學特性，以及它們和表面電漿子與強微共振腔結構之間的交互作用進行了研究。發現其反射頻譜在其共振頻率處會有明顯的峰值，而其頻率可藉由改變共振腔長度來調變。最後，我們針對強微共振腔結構與強吸光材料之間的交互作用進行討論，發現了類似上述的選擇性反射現象，未來有可能應用在反射式顯示器上。In this dissertation, first the optical modeling and emission characteristics of OLEDs with anisotropic and isotropic emitting materials were discussed. Devices with anisotropic and isotropic emitting materials were fabricated and measured for comparison with simulation results. Experimental results match calculated results fairly well, therefore confirming the validity of the model.
Then the emission characteristics of tandem white OLEDs (R+G+B tandem, 2-color+1-color tandem, and white+white tandem) were analyzed. It was found that 2-color + 1-color tandem structure gives lower color shift than the other two types.
The weak-microcavity device structures with varied ITO thicknesses were investigated theoretically and experimentally. The efficiency characteristics of these devices showed significant variations (1.34 times in quantum efficiencies, 1.44 times in cd/A efficiencies and 1.51 times in lm/W efficiencies) in varying ITO thickness.
Furthermore, we recycled a portion of surface plasmon polaritons (SPPs) in OLEDs by capping the thinned metal electrode with an appropriate absorbing/re-emission medium, inducing SPP-mediated energy transfer and re-emission. Such an approach may be used for implementing double-emitting OLEDs with different emission colors on two sides and with a broad color tuning capability.
Next, the optical properties of metal nanoparticles and their interaction with SPPs and strong-microcavity structures were investigated. It was found that the reflectance spectra show obvious peaks around the resonance frequencies and they can be tuned by changing the cavity length. Finally, interaction between strong-microcavity structures and the strongly absorptive capping was discussed. Selective reflection phenomena were observed, which have the potential for use in reflective displays
Going Beyond Counting First Authors in Author Co-citation Analysis
Get PDFThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Variations on the Author
Get PDF“Variations on the Author” discusses two of Eduardo Coutinho’s recent films (Um Dia na Vida, from 2010, and Últimas Conversas, posthumously released in 2015) and their contribution to the general question of documentary authorship. The director’s filmography is characterized by a consistent yet self-effacing form of authorial self-inscription: Coutinho often features as an interviewer that rather than express opinions propels discourses; an interviewer that is good at listening. This mode of self-inscription characterizes him as an author who is not expressive but who is nonetheless markedly present on the screen. In Um Dia na Vida, however, Coutinho is completely absent form the image, while Últimas Conversas, on the contrary, includes a confessional prologue that moves the director from the margins to the center of his films. This article examines the ways in which these works stand out in the filmography of a director who offers new insights into the notion of cinematic authorship
Appropriate Similarity Measures for Author Cocitation Analysis
Get PDFWe provide a number of new insights into the methodological discussion about author cocitation analysis. We first argue that the use of the Pearson correlation for measuring the similarity between authors’ cocitation profiles is not very satisfactory. We then discuss what kind of similarity measures may be used as an alternative to the Pearson correlation. We consider three similarity measures in particular. One is the well-known cosine. The other two similarity measures have not been used before in the bibliometric literature. Finally, we show by means of an example that our findings have a high practical relevance.information science;Pearson correlation;cosine;similarity measure;author cocitation analysis
Dispelling the Myths Behind First-author Citation Counts
Get PDFWe conducted a full-scale evaluative citation analysis study of scholars in the XML research field to explore just how different from each other author rankings resulting from different citation counting methods actually are, and to demonstrate the capability of emerging data and tools on the Web in supporting more realistic citation counting methods. Our results contest some common arguments for the continued
use of first-author citation counts in the evaluation of scholars, such as high correlations between author rankings by first-author citation counts and other citation
counting methods, and high costs of using more realistic citation counting methods that are not well-supported by the ISI databases. It is argued that increasingly available digital full text research papers make it possible for citation analysis studies to go beyond what the ISI databases have directly supported and to employ more
sophisticated methods
koamabayili/VECTRON-author-checklist: VECTRON author checklist
No full textWe have done our best to complete the author checklist relating to the use of animals in the hut study. Note that the objective for the hut study was to evaluate the IRS treatment applications for residual efficacy against Anopheles mosquitoes, including the local An. coluzzii mosquito population. Cows were only used to attract mosquitoes into the huts and no tests were carried out directly on the cows. The author checklist is intended for use with studies where experiments are carried out on animals, which is why we have had such difficulty in completing this for the hut study, as many of the questions do not relate to how the cows were used
Author-wise bibliometric analysis based on entropy.
No full textAuthor-wise bibliometric analysis based on entropy.</p
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