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| ???org.dspace.app.webui.jsptag.ItemTag.dcfield??? | Value | Language |
|---|---|---|
| dc.contributor.advisor | 劉如熹(Ru-Shi Liu) | |
| dc.contributor.author | Hsin-Yu Tsai | en |
| dc.contributor.author | 蔡欣妤 | zh_TW |
| dc.date.accessioned | 2021-06-17T03:22:35Z | - |
| dc.date.available | 2021-07-02 | |
| dc.date.copyright | 2018-07-02 | |
| dc.date.issued | 2018 | |
| dc.date.submitted | 2018-06-19 | |
| dc.identifier.citation | 參考文獻
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| dc.identifier.uri | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/69654 | - |
| dc.description.abstract | 鈣鈦礦量子點具可藉溶液法製備、易加工、波長可調性、量子效率高等優點，極適合光電領域之應用，如發光二極體(light-emitting diode; LED)、量子點式有機發光二極體(quantum dots light-emitting diode; QLED)、雷射、光感測器(photodetector)、太陽能電池(solar cell)等方面之應用潛能。銫鉛鹵素鈣鈦礦量子點(CsPbX3)，因其具半高寬15－40 nm之窄譜帶與高量子效率之優勢，而被視為應用於廣色域顯示器最具希望之窄譜帶綠色螢光材料。然因量子點存在表面缺陷、熱穩定性差與液態不易封裝之缺點，使其於量子點式有機發光二極體之應用受限。
本研究乃藉由硫氰酸根鹽類修飾鈣鈦礦量子點表面以獲得高量子效率之窄譜帶銫鉛鹵素鈣鈦礦量子點螢光材料。修飾後之銫鉛鹵素鈣鈦礦量子點與未修飾之量子點相比，其絕對量子效率將提升約1.5倍。而其鈍化機制以硫氰酸根離子吸附鈣鈦礦量子點表面過剩之鉛離子並使表面缺陷降低，且比較銫鉛鹵素鈣鈦礦量子點其修飾前後之晶格結構，顯示晶相與結構皆無變化，表示以硫氰酸根離子修飾鈣鈦礦表面不僅能提升量子效率且不影響其結構。此外，藉硫氰酸根鹽類作為表面修飾之藥品，皆可運用於紅光、綠光與藍光之銫鉛鹵素鈣鈦礦量子點上。 此外，以摻錫之鈣鈦礦量子點CsPb0.67Sn0.33Br3作為母液並與硫氰酸銨修飾後之樣品比較，因鈣鈦礦量子點表面具許多有機配體將影響製成元件時之成膜性，如十八烯、油酸與油胺，此三種溶劑皆影響元件放光層之成膜性與導電性 ，故先須藉丙酮去除表面過量之有機配體，藉以優化其放光層，於元件上將具更佳之表現。本研究經由硫氰酸鹽類進行表面修飾後之樣品其光譜相較於母液無明顯紅移之現象，並顯示量子點之間無明顯聚集之現象，其鈣鈦礦量子點仍為立方體之結構，綜合以上數據之結果顯示修飾後之樣品不僅能提升效率並減少量子點團聚，修飾後之樣品將可於未來應用於有機式發光二極體。 | zh_TW |
| dc.description.abstract | White light-emitting diodes (LEDs) is widely used as backlighting components in the modern liquid-crystal display (LCD). For high-quality backlight, color saturation and color gamut are the key indicators, which affect the color performance display devices. Perovskite CsPbBr3 quantum dots (QDs) are regarded as the most promising narrow-band green-emitting material for wide-color-gamut backlight displays because of their high photoluminescence quantum yield (PLQY) and the narrow-band emission with a full width at half maximum (FWHM) of ∼20 nm. Despite their growing popularity, CsPbBr3 QDs have several shortcomings such as the existence of surface trap states, poor thermal and aqueous stability, and the solution QDs are unsuitable for direct use in on-chip white LEDs. Here, the surface treatment of perovskite CsPbBr3 QDs with thiocyanate salts (SCN-) toward high brightness and stable narrow-band green emission was investigated. After the treatment, a high quantum yield and stable narrow-band perovskite CsPbX3-SCN was obtained. The product exhibited several advantages, including high absolute PLQY of 94%, enhaced photoluminescence intensity, and air stability.
Moreover, CsPbBr3-SCN perovskite QDs are potential emitters for QLED electroluminescent displays. However, balancing their performance and their environmentally friendly property is challenging. To achieve such balance, we demonstrated an easy hot-injection method to synthesize Cs(Pb1-xSnx)Br3 QDs by partially replacing the toxic Pb2+ with the highly stable Sn4+. Meanwhile, the absolute PLQY of Cs(Pb0.67Sn0.33)Br3 QDs increased from 45% to 83% compared with CsPbBr3. Based on a femtosecond transient absorption, time-resolved PL, and single-dot spectroscopies, we conclude that the PLQY enhancement is due to the reduction of trion formation in perovskite QDs with Sn4+ substitution. Moreover, the CsPbBr3-SCN solution that surface treatment with thiocyanate salt increased the performance of QLED devices based on these highly luminescent cesium lead halide perovsike QDs, exhibiting a central emission wavelength of 516 nm, a current efficiency of 4.2 cd/A, and an external quantum efficiency of 1.4% which is the higher values among the CsPbBr3 perovskite QLED devices. | en |
| dc.description.provenance | Made available in DSpace on 2021-06-17T03:22:35Z (GMT). No. of bitstreams: 1 ntu-107-R05223151-1.pdf: 5903701 bytes, checksum: c2d822a4d59734b3eccfd50d663fc804 (MD5) Previous issue date: 2018 | en |
| dc.description.tableofcontents | 總目錄
口試委員會審訂書 i 誌謝 ii 摘要 iii Abstract iv 總目錄 vi 圖目錄 ix 表目錄 xiii 第一章 緒論 1 1.1 奈米材料之簡介 1 1.1.1 量子尺寸效應與量子侷限效應 2 1.1.2小尺寸效應 5 1.1.3 表面效應 6 1.2 量子點之簡介 6 1.2.1 量子點種類介紹 8 1.2.2 發光特性 9 1.2.3 量子效率 10 1.3鈣鈦礦量子點簡介 11 1.3.1 鈣鈦礦量子點之結構 12 1.3.2 鈣鈦礦奈米粒子之合成 13 1.3.3 鈣鈦礦量子點之表面特性 15 1.4 鈣鈦礦量子點之缺陷改善 15 1.4.1 鈣鈦礦量子點之表面修飾 17 1.4.2 鈣鈦礦量子點之異質原子 18 1.4.3 鈣鈦礦量子點之錫離子摻雜 22 1.5 鈣鈦礦量子點之應用 23 1.5.1 發光二極體背光顯示 23 1.5.1.1 CIE1931色度座標 25 1.5.1.2 色域面積(color gamut) 27 1.5.1.3 顏色純度 27 1.5.2 量子點式發光二極體 29 1.5.2.1 光致發光 29 1.5.2.2 電致發光 32 1.6 研究動機與目的 36 第二章 實驗步驟與儀器分析原理 38 2.1 化學藥品 39 2.2 實驗步驟 40 2.2.1 油酸銫前驅物之配製 40 2.2.2 綠光鈣鈦礦CsPbBr3量子點之合成 40 2.2.3 藍光鈣鈦礦CsPb(Br0.5Cl0.5)3量子點之合成 41 2.2.4 紅光鈣鈦礦CsPb(Br0.4I0.6)3量子點之合成 41 2.2.5 綠光鈣鈦礦Cs(Pb1-xSnx)Br3量子點之合成 41 2.2.6 硫氰酸銨表面修飾CsPbX3量子點 41 2.2.7 鈣鈦礦量子點式有機發光二極體之元件製備 42 2.3 儀器分析原理 43 2.3.1螢光光譜儀(photoluminescence spectrometer; PL) 43 2.3.2紫外光/可見光吸收光譜儀(UV/Vis absorption spectroscopy) 44 2.3.3 量子效率(photoluminescence quantum yield; PLQY) 46 2.3.4瞬態吸收光譜(transient absorption spectra; TA)與時間解析螢光光譜(time-resolved photoluminescence; TRPL) 47 2.3.5傅立葉轉換紅外光譜儀(Fourier-transform infrared spectrometer; FTIR) 48 2.3.6感應耦合電漿發射光譜儀(inductively coupled plasma optical emisson spectroscopy; ICP-OES) 50 2.3.7 粉末X光繞射儀(powder X-ray diffraction microscopy; XRD) 51 2.3.8 X射線吸收光譜(X-ray absorption spectroscopy; XAS) 53 2.3.9 X射線光電子能譜儀(X-ray photoelectron spectroscopy; XPS) 53 2.3.10 穿透式電子顯微鏡(transmission electron microscopy; TEM) 55 2.3.11 積分球(integrating sphere) 56 2.3.12分光輝度計(spectroradiometer) 57 第三章 結果與討論 58 3.1 CsPbX3鈣鈦礦量子點之晶體結構與光學鑑定 58 3.2 CsPb0.67Sn0.33Br3鈣鈦礦量子點之晶體結構與光學鑑定 59 3.3以硫氰酸根鹽類修飾CsPbX3之表面 60 3.3.1以硫氰酸根鹽類修飾CsPbBr3綠光之表面 62 3.3.2以硫氰酸根鹽類修飾CsPb(Br0.5Cl0.5)3藍光之表面 65 3.3.3以硫氰酸根鹽類修飾CsPb(Br0.4I0.6)3紅光之表面 66 3.3.4以硫氰酸根鹽類修飾摻錫之Cs(Pb0.67Sn0.33)Br3表面 67 3.4 表面修飾後之鈣鈦礦量子點穩定性探討 69 3.5 經SCN修飾之CsPbBr3應用於量子點式有機發光二極體 71 第四章 結論 75 參考文獻 76 | |
| dc.language.iso | zh-TW | |
| dc.subject | 鈣鈦礦 | zh_TW |
| dc.subject | 表面修飾 | zh_TW |
| dc.subject | 發光二極體 | zh_TW |
| dc.subject | 量子點 | zh_TW |
| dc.subject | 銫鉛鹵素 | zh_TW |
| dc.subject | perovskites | en |
| dc.subject | cesium lead halide | en |
| dc.subject | quantum dots | en |
| dc.subject | light-emitting diode | en |
| dc.subject | surface treatment. | en |
| dc.title | 全無機鈣鈦礦量子點應用於有機發光二極體之研究 | zh_TW |
| dc.title | All-Inorganic Perovskite Quantum Dots for Organic Light-Emitting Diodes | en |
| dc.type | Thesis | |
| dc.date.schoolyear | 106-2 | |
| dc.description.degree | 碩士 | |
| dc.contributor.oralexamcommittee | 梁文傑(Man-Kit Leung),林唯芳(Wei-Fang Su),魏大華(Da-Hua Wei),李育群(Adam Lee) | |
| dc.subject.keyword | 鈣鈦礦,銫鉛鹵素,量子點,發光二極體,表面修飾, | zh_TW |
| dc.subject.keyword | perovskites,cesium lead halide,quantum dots,light-emitting diode,surface treatment., | en |
| dc.relation.page | 83 | |
| dc.identifier.doi | 10.6342/NTU201800989 | |
| dc.rights.note | 有償授權 | |
| dc.date.accepted | 2018-06-19 | |
| dc.contributor.author-college | 理學院 | zh_TW |
| dc.contributor.author-dept | 化學研究所 | zh_TW |
| Appears in Collections: | 化學系 | |
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| File | Size | Format | |
|---|---|---|---|
| ntu-107-1.pdf Restricted Access | 5.77 MB | Adobe PDF |
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