Synthesis and electroluminescence properties of highly efficient dual core chromophores with side groups for blue emission

Lee, Hayoon; Kim, Beomjin; Kim, Seung‐Ho; Kim, Joonghan; Lee, Jae-Hyun; Shin, Hoon−Kyu; Lee, Jihoon; Park, Jong‐Wook

doi:10.1039/c4tc00075g

Cited by 73 publications

(50 citation statements)

References 31 publications

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“…24 The most common method for the preparation of magnetite nanoparticles is the chemical coprecipitation of iron salts. 25,26 The co-precipitation technique is probably the simplest and the most efficient chemical pathway to obtain magnetic particles. Iron oxides are generally prepared by hydrolysis of stoichiometric mixture of ferrous and ferric salts in aqueous medium.…”

Section: Resultsmentioning

confidence: 99%

Molecular insights into the selective action of a magnetically removable complexone-grafted adsorbent

et al. 2015

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The binding and release of trivalent rare earth element (REE) cations (Dy(3+), Nd(3+) and La(3+)) from solutions by a new fully characterized magnetic nano adsorbent material, consisting of iminodiacetic acid ligand (H2IDA) grafted onto SiO2 covered γ-Fe2O3 nanoparticles, was investigated. The nano adsorbent revealed a slightly higher capacity towards heavier REE and appreciable selectivity, especially on desorption. It was found that the composition of the surface complex was RE(3+) : L = 1 : 1. The complexation of the molecular H2IDA with RE(3+) in this ratio under non-basic conditions was therefore investigated by X-ray crystallography to produce relevant molecular models. Unexpectedly big differences in coordination numbers and binding mode of IDA along with distinct analogies in packing of the ligand molecules in the obtained 2D-coordination polymer structures provided valuable insights into possible reasons for the observed selectivity.

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Section: Resultsmentioning

confidence: 99%

Molecular insights into the selective action of a magnetically removable complexone-grafted adsorbent

et al. 2015

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“…32,[46][47][48] The typical FE-SEM images of the blue Strip 0.0 with different magnications, as well as the well-dened brous morphology with good structural stability, are presented in Fig. Signicantly, all the strips could last up to 6 months at room temperature without any specic treatment, which shows an evident improvement compared to liposomes.…”

Section: Resultsmentioning

confidence: 99%

“…1A and A 0 . 1B 0 ) instead of being exposed on the ber surface, and therefore the WCA of Strip 0.5 (47 ) only undergoes a subtle change compared with Strip 0.0 . Ascribed to the inherent hydrophilic characteristics of PAN matrix, the water contact angle (WCA) of Strip 0.0 is 34 .…”

Section: Resultsmentioning

confidence: 99%

Constitution of a visual detection system for lead(ii) on polydiacetylene–glycine embedded nanofibrous membranes

Wang

Wen

et al. 2015

J. Mater. Chem. A

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With the aim to develop pH-paper-like lead ion (Pb 2+ ) sensing materials, we demonstrate a colorimetric strip, which relies on a SiO 2 nanoparticle (NP) decorated polydiacetylene embedded polyacrylonitrile nanofibrous membrane (PAN NFM), that undergoes a brilliant blue-to-red color transition as well as 'Turn-On' fluorescence upon incubation with Pb 2+ . The introduction of an amino acid (glycine) headgroup into a supramolecularly assembled 10,12-pentacosadiynoic acid results in a Pb 2+ -induced chromic conjugated polymer that is quickly photopolymerizable, rapidly responsive to Pb 2+ and specifically identifiable. Moreover, the SiO 2 NPs are certified as an efficient sensitivity promoter when their content reaches 0.5 wt% in the strip. With this understanding, the color change that is caused by 0.24 mM Pb 2+ at ambient temperature can be easily perceived by the naked eye, which indicates the superiority of our strip compared with previous approaches, and it is also noteworthy that a fluorescent signal could also be produced in 2 min. Furthermore, RGB (red-green-blue) digital parameters obtained from images of the strips and automatic read outs via a smartphone were processed statistically through principal component analysis and then used to elaborate the standard curve and quantify Pb 2+ concentration. This methodology for assaying and quantifying Pb 2+ avoids time-consuming sample preparation, expensive laboratory techniques, and specialized personnel required to carry out conventional analytical methods. † Electronic supplementary information (ESI) available: The experimental procedures of assembly of PDA-Gly liposomes and Pb 2+ detection based on PDA-Gly liposomes, the details of 1 H and 13 C NMR spectroscopy for the structural conrmation of PCDA-Gly, the optical images of three types of strips from le to right display the color changes caused by temperature, and the corresponding CR% of the strips at each temperature point upon heating from 20 to 50 C, the sensing performance of PDA-Gly liposomes, and schematic of a representative procedure used to calculate principle component by a scalable RGB technique under the assistance of a smartphone. UV-vis spectra and CR value of Strip 0.5 in the presence of Pb 2+ (3 mM) and various other metal ions (30 mM), including Na + , K + , Ca 2+ , Fe 2+ , Ni 2+ , Hg 2+ , Cu 2+ , Zn 2+ , Co 2+ , and Cd 2+ in HEPES buffer. Insets show the corresponding color change photographs. See Fig. 5 (A) The time-dependent CLSM images of Strip 0.5 before and after incubation with 0.24 mM Pb 2+ and (B) their normalized fluorescence intensity and distribution (l ext ¼ 405 nm). 9728 | J. Mater. Chem. A, 2015, 3, 9722-9730 This journal is

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“…Yield was 61%. Synthesis of 9-boroanthracene (5). 9-bromoanthracence (10.0 g, 38.9 mmol) was dissolved in anhydrous THF solution (500 mL) and stirred at −78 • C. Then, 1.6 M n-BuLi (29.3 mL, 46.7 mmol) was added.…”

Section: Synthesismentioning

confidence: 99%

“…[4] In order to fabricate full color OLED displays, we need high performance red-, green-, and blue-light emitters with high electroluminescence (EL) efficiencies, good thermal properties, long device lifetimes, and pure color coordinates. [5] Furthermore, balanced carrier injection and carrier transportation between device layers are required for high device efficiency. Unbalanced hole and electron current form a narrow combination zone, which leads to low efficiency with high roll-off and shorter lifetime.…”

Section: Introductionmentioning

confidence: 99%

New Emitting Materials Based on HTL Moiety with High Hole Mobility for OLEDs

Kang

Lee

Shin

et al. 2015

Molecular Crystals and Liquid Crystals

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New green emitting compounds based on tris(N-methylindolo)benzene (NMT), anthracene and pyrene were synthesized. NMT-An and NMT-Py were used as an emitting layer in OLED device to examine emitting property. OLED device containing NMT-An emitting layer and conventional hole transporting layer (HTL) of NPB was found to exhibit better characteristics compared to NMT-Py. And that device showed maximum EL emission at 502 nm and 550 nm, CIE coordinates (0.38, 0.48), and a luminance efficiency of 2.06 cd/A. Also when NMT and NMT-An were used as a HTL instead of NPB, the device including NMT-An emitter showed 2.67 cd/A and 2.29 cd/A in luminance efficiency.

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Synthesis and electroluminescence properties of highly efficient dual core chromophores with side groups for blue emission

Abstract: We introduced phenyl and naphthyl groups onto various positions of dual cores. Of the synthesized compounds, Na-AP-Na was found to exhibit the highest EL device efficiency of 5.46 cd A−1.

Cited by 73 publications

References 31 publications

Molecular insights into the selective action of a magnetically removable complexone-grafted adsorbent

Molecular insights into the selective action of a magnetically removable complexone-grafted adsorbent

Constitution of a visual detection system for lead(ii) on polydiacetylene–glycine embedded nanofibrous membranes

New Emitting Materials Based on HTL Moiety with High Hole Mobility for OLEDs

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