New platinum complexes exhibiting host dependent photoluminescence as single dopants in double emitting layer, voltage independent hybrid white electroluminescence devices

Please use this identifier to cite or link to this item: https://ir.lib.ncu.edu.tw/handle/987654321/101609

Title:	New platinum complexes exhibiting host dependent photoluminescence as single dopants in double emitting layer, voltage independent hybrid white electroluminescence devices
Authors:	陳錦地;Poloek, Anurach;Wang, Chieh;Chang, Yung-Ting;Lin, Chiao-Wen;Chen, Chao-Tsen;Chen, Chin-Ti
Contributors:	理學院化學學系
Date:	2015-09-22
Issue Date:	2026-04-21 14:38:58 (UTC+8)
Publisher:	Royal Society of Chemistry
Abstract:	摘要： Four heteroleptic platinum complexes ( FPtXND s) bearing 4-hydroxy-1,5-naphthyridine ( XND ) derivatives functionalized with phenyl ( X = Ph ), dimethylamino ( X = dma ), morpholino ( X = mor ), or phenoxazino ( X = pxz ) units as one ligand and 2-(2,4-difluorophenyl)pyridine ( F ) as the other common ligand were newly synthesized and characterized. Each platinum complex has absorption and photoluminescence (PL) spectroscopic characteristics. As demonstrated by X-ray crystallography (of FPtdmaND and FPtpxzND ), electrochemical and theoretical studies, the unusual spectroscopic features of FPtpxzND (such as its weak absorption band around 450-600 nm, its significant concentration dependent solution PL wavelength but low host dependent thin film PL wavelength (which is relatively long) and its particularly low solution PL quantum yield ( Φ PL )) the relatively strong absorption of FPtdmaND and FPtmorND , and the relatively long PL wavelength of FPtPhND have been reasonably explained. After each platinum complex had been examined for monochromatic organic light-emitting diodes (OLEDs), having a relatively high Φ PL as well as an appropriate greenish yellow PL in the monomeric form and an orange to red PL in the aggregate/excimeric form, FPtdmaND and FPtmorND have been chosen as dopant materials in the construction of single or double emitting layer (EML) hybrid white organic light-emitting diodes (OLEDs). A high performance warm white electroluminescence (EL) (CIE x , y (0.42-0.43, 0.43-0.44)) was obtained where the same platinum complex dopant FPtdmaND was doped (5 or 8 wt%) in two EMLs, 4,4′-di(9 H -carbazol-9-yl)-1,1′-biphenyl (CBP) harvesting monomeric emission and the highly fluorescent blue N , N ′-di-1-naphthalenyl- N , N ′-diphenyl-[1,1′:4′,1′′:4′′,1′′′-quaterphenyl]-4,4′′′-diamine (4P-NPD) harvesting excimer/aggregate emission. This warm white EL showed a high colour rendering index (CRI) of 86-88, and a reasonably good EL efficiency of 9.7%, 22.5 cd A −1 , or 10.7 lm W −1 . EL with improved white chromaticity (CIE x , y (0.37-0.39, 0.39-0.41)) can be obtained using FPtmorND as the single dopant, although it has a somewhat inferior CRI (84-86) and EL efficiency (8.3%, 20.1 cd A −1 , or 9.5 lm W −1 ). Nevertheless, both double EML hybrid white OLEDs exhibit a rather constant CRI and CIE x , y under a driving voltage between 7 and 10 V. New platinum complexes ( FPtXND s) bearing 4-hydroxy-1,5-naphthyridines ( XND s) functionalized with phenyl, dimethylamino, morpholino or phenoxazino ( X = Ph , dma , mor or pxz ) units were used in hybrid white OLEDs. 出版日期： 2015-10-22 資源來源： Royal Society of Chemistry 識別號： ISSN: 2050-7526 識別號： EISSN: 2050-7534 識別號： DOI: 10.1039/c5tc02523k
Appears in Collections:	[Department of Chemistry] journal & Dissertation

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