Key Laboratory of Bioinorganic and Synthetic Chemistry

Key Laboratory of Bioinorganic and Synthetic Chemistry

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Zhang X.,Key Laboratory of Bioinorganic and Synthetic Chemistry | Zhang X.,Sun Yat Sen University | Yu J.,Key Laboratory of Bioinorganic and Synthetic Chemistry | Wang J.,Key Laboratory of Bioinorganic and Synthetic Chemistry | And 10 more authors.
ACS Photonics | Year: 2017

Superhigh brightness, reliability, and modularization are three key features of state-of-the-art high-brightness solid state lighting, such as high-power white light-emitting diodes (white LEDs) and white laser diodes (white LDs). However, these features are inevitably limited by the organic resin packing material, as a crucial component of the white lighting device, because of its unstable property at high temperature and low thermal conductivity. Here, we report a robust light convertor that can simultaneously play key roles as a phosphor and an alternative encapsulating material via phosphor-in-glass (PiG) engineering. We employed a combination of powder X-ray diffraction, scanning electron microscope, energy dispersive spectrometer (EDS), EDS mapping, confocal laser scanning microscope, cathodoluminescence mapping, in conjunction with micro-PL system with a point-by-point scanning mode to study the detailed structure of PiG samples. This Y3Al5O12:Ce3+-based PiG exhibits a high external quantum efficiency of ∼60%, a high thermal conductivity of ∼0.59 W/mK, exceptional thermal stability, and excellent moisture resistance. By combining the as-synthesized PiG with high-power blue chip-on-board, a high luminous efficacy (92 lm/W) modular white LEDs with a luminous flux up to 1076 lm and a high color rendering modular warm white LEDs (Ra = 90.3 and CCT = 3585 K) are achieved. Moreover, a modular white LDs with a higher luminous efficacy (110 lm/W) is also achieved through blue LDs pumping. The results demonstrate that this easy-fabrication, low-cost, and long-term reliable high-brightness modular white LEDs or white LDs is expected to be a promising candidate for next-generation illumination. © 2017 American Chemical Society.


Li B.,Key Laboratory of Bioinorganic and Synthetic Chemistry | Shi J.,Qingdao Agricultural University | Zhang W.,Key Laboratory of Bioinorganic and Synthetic Chemistry | Wang J.,Key Laboratory of Bioinorganic and Synthetic Chemistry | And 2 more authors.
Journal of the Electrochemical Society | Year: 2010

A series of green long-lasting phosphorescence materials Ca8 Mg (SiO4) 4 Cl2: Eu2+, RE3+ (RE=La-Lu) was systematically investigated by long-lasting phosphorescence and thermoluminescence spectra. The green phosphorescence predominates at 502 nm due to the 4 f6 5d→4 f7 transition of the Eu 2+ ion. It strongly depends on the co-doped rare-earth ion, and its performance decreases in the order Nd>Sm>Ho>Dy>Ce>Pr>La> Gd>Tm>Er>Tb>Lu; for the Yb ion, the phosphorescence is totally quenched. The thermoluminescence properties show that there are generally four peaks around 330, 370, 435, and 470 K in the temperature range of 293-577 K, associated with the foreign defects due to the aliovalent substitution of rare-earth ions. The relationship of the long-lasting phosphorescence and thermoluminescence properties show that the difference in trap depth and the density of charge trapping centers and trapped charges, associated with thermoluminescence characteristics in the temperature range of 300-400 K, is responsible for the regular variation in the green long-lasting phosphorescence. The thermoluminescence spectrum of Ca8 Mg (SiO4) 4 Cl2: Eu2+, Nd3+ is fitted by the general kinetic model. The most appropriate trap depth in the present host is estimated to be around 0.8 eV, and the kinetic-order parameter b is 1.14. © 2010 The Electrochemical Society.


Lin J.-M.,Key Laboratory of Bioinorganic and Synthetic Chemistry | He C.-T.,Key Laboratory of Bioinorganic and Synthetic Chemistry | Liao P.-Q.,Key Laboratory of Bioinorganic and Synthetic Chemistry | Zhou D.-D.,Key Laboratory of Bioinorganic and Synthetic Chemistry | And 2 more authors.
Science China Chemistry | Year: 2016

Solvothermal reaction of Zn(NO3)2, 4-(1H-pyrazol-4-yl)pyridine (Hpypz) and 1,3,5-benzenetricarboxylic acid (H3btc) in N,N-dimethylacetamide (DMA) produced a new porous coordination polymer [Zn5(pypz)4(btc)2] (1). Single-crystal X-ray diffraction study of 1 showed that deprotonated pypz– ligands served as 1,2,4-triazolate-like ligands, linking Zn(II) ions to form porous two-dimensional (2-D) sql-a layers {Zn(pypz)}+, which were further connected by eight-legged pillars {Zn2(btc)4(H2O)2}8– based on the typical paddlewheel dinuclear Zn2(RCOO)4(H2O)2 cluster to form a novel type of non-interpenetrated pillared-layer framework with 3-D intersecting pore system and large pore volume. Gas sorption measurements revealed that 1 possesses large BET surface area of 2061 m2 g–1 and very high methane total uptake of 245 cm3(STP) cm–3 at 298 K and 65 bar. © 2016, Science China Press and Springer-Verlag Berlin Heidelberg.


Wang B.-Y.,Key Laboratory of Bioinorganic and Synthetic Chemistry | He C.-T.,Key Laboratory of Bioinorganic and Synthetic Chemistry | Huang B.,Key Laboratory of Bioinorganic and Synthetic Chemistry | Xu W.-J.,Key Laboratory of Bioinorganic and Synthetic Chemistry | And 4 more authors.
Science China Chemistry | Year: 2015

A new bromethyl-substituted molecular rotor, [Cu(dabcoCH2Br)(H2O)Br3] (dabcoCH2Br+=1-(2-bromethyl)-1,4-diazoniabicyclo[2.2.2]octane cation), which belongs to a family of halomethyl-substituted molecular rotors, was synthesized and structurally characterized. The reversible phase transition at ca. 250 K was well established for this molecular rotor by thermal analyses, variable-temperature X-ray diffraction, and variable temperature dielectric measurements. The order-disorder transformation of the rotator part (dabco moiety) causes ferroelastic phase transition with an Aizu notation of mmmF2/m from high-temperature orthorhombic phase (Pbnm) to low-temperature monoclinic phase (P21/n). More important, in reference to the density functional theory calculations and structural analyses, the key factors to tune the phase transition behaviors are discussed in detail for this family of halomethyl-substituted molecular rotors. © 2015 Science China Press and Springer-Verlag Berlin Heidelberg

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