Synthesis, physical and electroluminescence properties of 3,6-dipyrenylcarbazole end capped oligofluorenes

RSC Advances ◽  
2015 ◽  
Vol 5 (34) ◽  
pp. 26569-26579 ◽  
Author(s):  
Tidaratana Sangchart ◽  
Arunroj Niroram ◽  
Teadkait Kaewpuang ◽  
Narid Prachumrak ◽  
Supawadee Namuangruk ◽  
...  
Keyword(s):  
Blue Emission ◽  
Device Performance ◽  
Thermally Stable ◽  
Good Solubility ◽  
Film Forming ◽  
Strong Blue Emission

A series of oligofluorenes bearing 3,6-dipyrenylcarbazoles as the terminal substituents showed strong blue emission with good solubility, and thermally stable amorphous and excellent film-forming properties. OLEDs using these materials exhibited excellent device performance.

Thermally Stable Copper(II)-Doped Cesium Lead Halide Perovskite Quantum Dots with Strong Blue Emission

2019 ◽  
Vol 10 (5) ◽  
pp. 943-952 ◽  
Author(s):  
Chenghao Bi ◽  
Shixun Wang ◽  
Qiang Li ◽  
Stephen V. Kershaw ◽  
Jianjun Tian ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Blue Emission ◽  
Thermally Stable ◽  
Perovskite Quantum Dots ◽  
Strong Blue Emission ◽  
Halide Perovskite ◽  
Lead Halide

Pyridine-Incorporated Dihexylquaterthiophene: A Novel Blue Emitter for Organic Light Emitting Diodes (OLEDs)

2012 ◽  
Vol 65 (9) ◽  
pp. 1244 ◽  
Author(s):  
Prashant Sonar ◽  
Sonsoles Garcia Santamaria ◽  
Ting Ting Lin ◽  
Alan Sellinger ◽  
Henk Bolink
Keyword(s):  
Light Emitting Diodes ◽  
Blue Emission ◽  
Organic Light Emitting Diodes ◽  
High Yield ◽  
Device Performance ◽  
Host Matrix ◽  
Maximum Brightness ◽  
Light Emitting ◽  
Organic Light ◽  
Processing Techniques

The synthesis and characterisation of 2,5-bis(5′-hexyl-[2,2′-bithiophen]-5-yl)pyridine (Th4PY) and its use as a blue emitter in organic light emitting diodes (OLEDs) is reported. Th4PY was synthesised in high yield using a straightforward Suzuki coupling route with commercially available starting materials. As Th4PY is both soluble and has low molecular weight, blue OLEDs were fabricated using both spin-coating and vacuum deposition thin film processing techniques to study the effect of processing on device performance. OLED devices using a spin-coated layer consisting of 4′,4′′-tris(N-carbazolyl)triphenylamine (TCTA) and 2-(4-biphenylyl)-5-(4-tert-butylphenyl)-1,3,4-oxadiazole (PBD) as a host matrix together with Th4PY as emitter exhibited highly efficient sky-blue emission with a low turn-on voltage of 3 V, a maximum brightness close to 15000 cd m–2 at 8 V, and a maximum luminous efficiency of 7.4 cd A–1 (6.3 lm W–1) with CIE coordinates of x = 0.212, y = 0.320. The device performance characteristics are compared using various matrices and processing techniques. The promising sky-blue OLED performance, solution processability, and ambient stability make Th4PY a promising blue emitter for application in OLEDs.

scholarly journals New Fluorescent, Thermally Stable and Film Forming Polyimines Containing Naphthyl Rings

2019 ◽  
pp. 899-912 ◽  
Author(s):  
Farah Qureshi ◽  
Muhammad Yar Khuhawar ◽  
Taj Muhammad Jahangir
Keyword(s):  
Thermally Stable ◽  
Film Forming

STRONG BLUE EMISSION IN ZnS:Tm

1963 ◽  
Vol 2 (5) ◽  
pp. 95-97 ◽  
Author(s):  
S. Ibuki ◽  
D. W. Langer
Keyword(s):  
Blue Emission ◽  
Strong Blue Emission

Strong Blue Emission from Sb3+-Doped Super Small CsPbBr3 Nanocrystals

2019 ◽  
Vol 10 (8) ◽  
pp. 1750-1756 ◽  
Author(s):  
Xiangtong Zhang ◽  
Hua Wang ◽  
Yue Hu ◽  
Yixian Pei ◽  
Shixun Wang ◽  
...  
Keyword(s):  
Blue Emission ◽  
Strong Blue Emission

Efficient non-doped fluorescent OLEDs with nearly 6% external quantum efficiency and deep-blue emission approaching the blue standard enabled by quaterphenyl-based emitters

2018 ◽  
Vol 6 (16) ◽  
pp. 4479-4484 ◽  
Author(s):  
Weixuan Zeng ◽  
Yongbiao Zhao ◽  
Weimin Ning ◽  
Shaolong Gong ◽  
Zece Zhu ◽  
...  
Keyword(s):  
Quantum Efficiency ◽  
External Quantum Efficiency ◽  
Blue Emission ◽  
Device Performance ◽  
Color Purity ◽  
Deep Blue ◽  
Blue Emitters ◽  
Excellent Color

Two quaterphenyl derivatives are rationally designed and synthesized as deep-blue emitters to simultaneously afford outstanding device performance and excellent color purity approaching the NTSC blue standard.

Strong blue emission from zinc hydroxide carbonate nanosheets

2016 ◽  
Vol 177 ◽  
pp. 242-248 ◽  
Author(s):  
Jing Mao ◽  
Xuemin Chen ◽  
Tao Ling ◽  
Xiwen Du
Keyword(s):  
Blue Emission ◽  
Zinc Hydroxide ◽  
Zinc Hydroxide Carbonate ◽  
Strong Blue Emission

[Na8Zn4(CH3CO2)16·2H2O]n: two-dimensional sheet-like coordination polymer with strong blue emission

2002 ◽  
Vol 5 (5) ◽  
pp. 361-365 ◽  
Author(s):  
Lei Z. Zhang ◽  
Peng Cheng ◽  
Wei Shi ◽  
Dai-Zheng Liao ◽  
Ying Xiong ◽  
...  
Keyword(s):  
Coordination Polymer ◽  
Blue Emission ◽  
Two Dimensional ◽  
Strong Blue Emission

scholarly journals New chromophores based on combination of ethylenedioxythiophene and carbazole fragments: synthesis and optoelectronic properties

2016 ◽  
Vol 4 (1) ◽  
Author(s):  
A.N. Bakiev ◽  
O.A. Mayorova ◽  
A.A. Gorbunov ◽  
I.V. Lunegov ◽  
E.V. Shklyaeva ◽  
...  
Keyword(s):  
Band Gap ◽  
Visible Spectrum ◽  
Band Gap Energy ◽  
Gap Energy ◽  
Good Solubility ◽  
Film Forming ◽  
Photovoltaic Applications ◽  
Key Steps ◽  
Homo Lumo ◽  
Stokes Shifts

AbstractTwo new D-π-A chromophores composed of an electron-donating carbazole unit linked through π- bridges, bearing 3,4-ethylenedioxythiophene (EDOT) moiety, with an electron withdrawing dicyanovinyl group (DCV) were successfully synthesized involving Suzuki or Heck cross-coupling and Knöevenagel reactions as the key steps. The obtained compounds absorb light over a broad spectral range, including the visible spectrum. The HOMO/LUMO energies and band gap energy values (Eg) were calculated on the basis of the experimental optical and electrochemical data: HOMO, LUMO, Eg (eV), −5.51, −3.14, 2.37 (4), −5.34, −3.14, 2.20 (7). The presence of the HC=CH unit in compound 7 resulted in the increase of the HOMO energy level, the decrease of a band gap value and red shifts of the absorption and emission bands in comparison with those of 4. Large Stokes shifts and broadband luminescence inherent to both chromophores suggest their use as materials for luminescent solar collectors (LSCs). The obtained compounds demonstrated good solubility and suitable thin-film forming properties. For this reason, they may be suitable for solution-processable photovoltaic applications.

Blue Upconversion Luminescence from Phosphor Tm3+/Yb3+ Co-Doped Gd2Mo3O9

2013 ◽  
Vol 683 ◽  
pp. 3-6
Author(s):  
Jia Yue Sun ◽  
Bing Xue ◽  
Guang Chao Sun ◽  
Dian Peng Cui ◽  
Hai Yan Du
Keyword(s):  
Solid State ◽  
Upconversion Luminescence ◽  
Blue Emission ◽  
Solid State Reaction Method ◽  
Solid State Lighting ◽  
Red Emission ◽  
Reaction Method ◽  
X Ray ◽  
Strong Blue Emission ◽  
Co Doped

The upconversion (UC) luminescence properties of phosphor Tm3+/Yb3+co-doped Gd2Mo3O9were investigated in detail. Tm3+/Yb3+co-doped Gd2Mo3O9was prepared by solid-state reaction method using Na2CO3as flux and characterized by powder X-ray diffractometry. Under 980nm excitation, Tm3+/Yb3+co-doped Gd2Mo3O9has exhibited a weak red emission near 651nm and strong blue emission at 476nm. Tm3+/Yb3+co-doped Gd2Mo3O9phosphor has been considered as a better candidate in solid-state lighting applications.

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