Blue Photoluminescence (blue + photoluminescence)

Distribution by Scientific Domains
Distribution within Polymers and Materials Science


Selected Abstracts


Blue Photoluminescence from Chemically Derived Graphene Oxide

ADVANCED MATERIALS, Issue 4 2010
Goki Eda
Blue photoluminescene (PL) from chemically derived graphene oxide has been observed. The PL is attributed to radiative recombination of electron,hole pairs in isolated "molecular" sp2 domains, which are present within the carbon,oxygen sp3 matrix in chemically derived graphene oxide. The PL intensity is correlated to the evolution of sp2 domains during reduction. [source]


ChemInform Abstract: Blue Photoluminescence in Ti-Doped Alkaline-Earth Stannates.

CHEMINFORM, Issue 2 2008
Takahiro Yamashita
Abstract ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a "Full Text" option. The original article is trackable via the "References" option. [source]


Advancing the Solid State Properties of Metallo-Supramolecular Materials: Poly(, -caprolactone) Modified , -Conjugated Bis(terpyridine)s and their Zn(II) Based Metallo-Polymers

MACROMOLECULAR RAPID COMMUNICATIONS, Issue 20 2008
Andreas Winter
Abstract A set of rigid , -conjugated bis(terpyridine) macroligands with poly(, -caprolactone) (pCL) on their side chains was synthesized and investigated. The introduced pCL chains gave rise to enhanced processability and film-forming properties of the materials. Blue photoluminescence with high quantum yields was observed in dilute solution and in the solid state, indicating that intermolecular aggregation of the , -conjugated systems was effectively suppressed. The macroligands were further used for coordination with zinc(II) ions leading to new metallo-polymers with high solubility, improved film-forming behavior and promising photophysical properties with respect to potential OLED applications. [source]


InN@SiO2 Nanomaterials as New Blue Light Emitters

EUROPEAN JOURNAL OF INORGANIC CHEMISTRY, Issue 23 2008
Prabhakaran Munusamy
Abstract In this article we report blue photoluminescence (, 450 nm) from InN@SiO2 nanomaterials. The InN@SiO2 nanomaterials were prepared by a simple precipitation reaction followed by a solid-state reaction. Various control experiments demonstrate that the interface between the InN and SiO2 seems to play a crucial role in the origin of the blue emission from the InN@SiO2 nanomaterial. The InN@SiO2 nanomaterial was characterized by using analytical methods such as TEM, XRD, Raman, XPS, and photoluminescence spectroscopy, which confirmed the existence of InN on SiO2 with a small excess of nitrogen relative to indium.( Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2008) [source]


Synthesis, Crystal Structures, and Photophysical Properties of Two Novel Lead(II),SIP Coordination Polymers (NaH2SIP = 5-Sulfoisophthalic Acid Monosodium Salt) Containing Tetranuclear Lead(II) Units

EUROPEAN JOURNAL OF INORGANIC CHEMISTRY, Issue 8 2006
Qing-Yan Liu
Abstract Two new PbII,SIP coordination polymers, {[Pb4(OH)2(SIP)2(H2O)](H2O)5}n (1) and [Pb3(SIP)2(H2O)5]n (2), have been synthesized by hydrothermal reactions of Pb(OH)2 or Pb(NO3)2 and 5-sulfoisophthalic acid monosodium salt (NaH2SIP) at 160 C, respectively. Single-crystal X-ray diffraction reveals that compound 1 has a 2D brick-wall-like architecture constructed from 1D tapes containing the basketlike tetranuclear [Pb4(,3 -OH)2(COO)2]. Compound 2 has a 2D-layered structure, which is constructed from a 1D-ladder structure composed of the cyclic [Pb4(SIP)2(COO)2] grid with the four Pb atoms nearly coplanar. In the solid state, compound 1 exhibits blue photoluminescence with the maximum emission intensity at 436 nm upon excitation at 335 nm. Compound 2 shows phosphorescence with the maximum emission intensity at 603 nm upon excitation at 426 nm. Both compounds have also been characterized by elemental analysis, IR spectra, TG analysis, and powder X-ray diffraction. ( Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2006) [source]


Substituent Effects on Crosslike Packing of 2,,7,-Diaryl- spiro(cyclopropane-1,9,-fluorene) Derivatives: Synthesis and Crystallographic, Optical, and Thermal Properties,

ADVANCED FUNCTIONAL MATERIALS, Issue 2 2007
Z. Wang
Abstract A series of 2,,7,-diarylspiro(cyclopropane-1,9,-fluorene) derivatives are efficiently synthesized and characterized to determine the reason for the "green-light" emission of these compounds. These compounds exhibit bright-violet to blue photoluminescence (PL) (,PLmax,=,353,419,nm) with excellent PL quantum efficiencies (,PL,=,83,100,%) in solution and show high thermal stabilities (Td,=,267,474,C). The variation of the optical properties of these molecules in the solid state depends on the different stacking modes of these compounds containing different substituents, which are revealed by crystallographic analysis. CH,, hydrogen bonds instead of intermolecular ,,, interactions act as the driving force between adjacent fluorenes, even though a very small dialkyl group (cyclopropane) is introduced at the C-9 position of fluorene. The crosslike molecular stacking efficiently reduces the energy transfer between the herring-like aggregates and therefore results in the absence of a "green-light" emission tail. In order to determine the cause of the "green-light" emission tails, the fluorescence spectra of the films annealed in N2 or in air are recorded. Broad green-light emission tails were observed for the films annealed in air, which might be caused by fluorenone defects generated during processing or during the course of the photophysical analysis by reaction with residual oxygen. [source]


Hydrothermal Route for Cutting Graphene Sheets into Blue-Luminescent Graphene Quantum Dots

ADVANCED MATERIALS, Issue 6 2010
Dengyu Pan
Water-soluble graphene quantum dots (GQDs, ca. 10 nm in diameter) that exhibit bright blue photoluminescence (PL) are prepared by hydrothermal (chemical) cutting of oxidized graphene sheets (see figure). The mechanisms of the cutting and luminescence are discussed. This discovery of PL of GQDs may extend the range of application of graphene-based materials to optoelectronics and biological labeling. [source]


Synthesis and optical properties of blue luminescent poly(2,6-naphthalene)s

JOURNAL OF POLYMER SCIENCE (IN TWO SECTIONS), Issue 12 2008
Takeshi Mori
Blue luminescent 2,6-naphthalene-based homopolymer and copolymers were synthesized by Yamamoto method using Ni(cod)2 and Pd-catalyzed Suzuki coupling, respectively. Two kinds of substituents, an electron rich 3,6,9-trioxaundecyloxy (a) and a bulky 2-isopropyl-5-methylhexyloxy (b), significantly suppressed excimeric emissions of polynaphthalenes in film states, which achieved pure blue photoluminescence. [source]


Synthesis and properties of new ultraviolet,blue-emissive fluorene-based aromatic polyoxadiazoles with confinement moieties

JOURNAL OF POLYMER SCIENCE (IN TWO SECTIONS), Issue 5 2003
Nam Choul Yang
Abstract Three families of fluorene,oxadiazole-based polymers with confinement moieties have successfully been prepared by the two-step method for polyoxadiazole synthesis. These polymers show good solubility in common organic solvents, high thermal stability, and strong violet and blue photoluminescence in solution and as films, respectively. Their low-lying highest occupied molecular orbital/lowest unoccupied molecular orbital energy levels originate from the electron deficiency of an oxadiazole moiety, and this suggests that they may be useful for blue-emitting and electron-transport/hole-blocking layers in electroluminescent devices. 2003 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem 41: 674,683, 2003 [source]


Synthesis and properties of amorphous blue-light-emitting polymers with high glass-transition temperatures

JOURNAL OF POLYMER SCIENCE (IN TWO SECTIONS), Issue 18 2001
V. Deimede
Abstract A series of soluble poly(arylene ether)s containing the phenylphosphine oxide moiety were synthesized by the polymerization of substituted oligophenylene diols with bis(fluorophenyl)phenylphosphine oxide. These amorphous polyethers had well-defined structures and showed blue photoluminescence combined with good thermal stability, especially when phenyl or ethoxy side groups were used. The glass-transition temperatures increased when the size of the oligophenylene segment increased from three to five rings or when the length of the alkoxy substituents decreased. Polymers with glass-transition temperatures up to 270 C were obtained. The absorption and photoluminescent spectra shifted to longer wavelengths with an increase in the oligophenylene block. A redshift was also observed on photoluminescent spectra in the transition from solution to the solid state. 2001 John Wiley & Sons, Inc. J Polym Sci Part A: Polym Chem 39: 3168,3179, 2001 [source]


Synthesis of Dendritic Oligo-Spiro(fluorene-9,9,-xanthene) Derivatives with Carbazole and Fluorene Pendants and their Thermal, Optical, and Electroluminescent Properties

MACROMOLECULAR RAPID COMMUNICATIONS, Issue 20 2009
Zengze Chu
Abstract Two novel spiro-configured ter(arylene-ethynylene) derivatives, TSF-Cz and TSF-F, have been designed and synthesized using spiro(fluorene-9,9,-xanthene) (SFX) as building blocks, introducing a hole-transporting carbazole and a fluorene chromophore as the peripheral functional group into the backbone through an oxygen atom. The two well-defined oligomers possess good solubility, film-forming quality, and high Tg's at 140 and 126,C, respectively. In addition, these oligomers exhibit blue photoluminescence (PL) emission both in solution and solid states. The double-layered devices fabricated using the two materials as the emitter show a sky-blue emission with a brightness and a current efficiency of 7,613,cd,,m,2 and 1.11,cd,,A,1 for TSF-Cz, and 1,507,cd,,m,2 and 0.36,cd,,A,1 for TSF-F, respectively. [source]