English  |  正體中文  |  简体中文  |  Items with full text/Total items : 27308/39152
Visitors : 2447324      Online Users : 36
RC Version 4.0 © Powered By DSPACE, MIT. Enhanced by NTU Library IR team.
Scope Adv. Search
LoginUploadHelpAboutAdminister

Please use this identifier to cite or link to this item: http://ntour.ntou.edu.tw:8080/ir/handle/987654321/41277

Title: Mechanoluminescence and Efficient White-Emitting OLEDs for Pt(II) Phosphors Bearing Spatially Encumbered Pyridinyl Pyrazolate Chelates
Authors: Wan-Shan Tsai
Li-Min Huang
Guan-Min Tu
Yun Chi
Wen-Yi Hung
Yo-Cheng Song
Mei-Rurng Tseng
Pi-Tai Chou
Gene-Hsiang Lee
Ken-Tsung Wong
Shuo-Hsien Cheng
Contributors: 國立臺灣海洋大學:光電科學研究所
Date: 2013
Issue Date: 2017-02-13T08:01:06Z
Publisher: Journal of Materials Chemistry C
Abstract: Abstract: Three Pt(II) complexes with a formula of [Pt(Lx)2], x = 1, 2 and 3, in which the pyrazole chelate (Lx)H represents 4-(2,6-diisopropylphenyl)-2-(3-trifluoromethyl-1H-pyrazol-5-yl)pyridine (1), 5-(2,6-diisopropylphenyl)-2-(3-trifluoromethyl-1H-pyrazol-5-yl)pyridine (2) and 4-(tert-butyl)-2-(3-trifluoromethyl-1H-pyrazol-5-yl)pyridine (3), were synthesized, and their photophysical properties were examined. Single-crystal X-ray diffraction studies of 1 and 2 reveal a planar molecular geometry with both Lx chelates adopting a mutually trans configuration. Distinctive packing arrangements within the crystal lattices are observed, e.g., complex 2 shows structural repetitions that prohibit formation of intimate π–π stacking, while complex 1 exhibits an ordered alignment along the axis of the square planar core framework and, remarkably, shows mechanoluminescence and concentration dependent photoluminescence in the poly(methyl methacrylate) matrix (PMMA). In sharp contrast, derivatives 2 and 3 show only the luminescence derived from the monomeric and aggregated state, respectively, which is attributed to the imposed substituent effect. For application, organic light emitting diodes (OLEDs) were also fabricated using the aforementioned blue dopant 1, attaining the peak external quantum efficiency, current and power efficiencies of ηext = 9.1%, ηc = 18.4 cd A−1 and ηp = 16.6 lm W−1 respectively. With the same device structure, devices based on 3 exhibit an extremely high efficiency orange emission (20.0%, 47.6 cd A−1, 50.8 lm W−1) due to the occurrence of extensive π–π-stacking. Upon combining blue-emitting phosphor 1 and orange-emitting phosphor 3, two white OLED devices are fabricated, one of which obtained by sequentially doping 1, 3 and then 1 into separated layers exhibits performance efficiencies of 11.3%, 28.3 cd A−1, and 21.2 lm W−1, highly stable chromaticity (CIEx = 0.41–0.40 and CIEy = 0.43–0.41), and an adequate color-rendering index (CRI) of 80 at brightness of 370 to 10 800 cd m−2. The other device obtained by co-doping 1 and 3 into a single emissive layer shows improved efficiencies of 15.0%, 44.8 cd A−1, and 46.2 lm W−1, but with a lower CRI of 63.
Relation: 45
URI: http://ntour.ntou.edu.tw:8080/ir/handle/987654321/41277
Appears in Collections:[光電科學研究所] 期刊論文

Files in This Item:

File Description SizeFormat
index.html0KbHTML64View/Open


All items in NTOUR are protected by copyright, with all rights reserved.

 


著作權政策宣告: 本網站之內容為國立臺灣海洋大學所收錄之機構典藏,無償提供學術研究與公眾教育等公益性使用,請合理使用本網站之內容,以尊重著作權人之權益。
網站維護: 海大圖資處 圖書系統組
DSpace Software Copyright © 2002-2004  MIT &  Hewlett-Packard  /   Enhanced by   NTU Library IR team Copyright ©   - Feedback