Phenothiazine based blue emitter for light-emitting electrochemical cells

2017 ◽  
Vol 41 (18) ◽  
pp. 9668-9673 ◽  
Author(s):  
Kanagaraj Shanmugasundaram ◽  
Ramesh Kumar Chitumalla ◽  
Joonkyung Jang ◽  
Youngson Choe
Keyword(s):  
Blue Emission ◽  
Green Emission ◽  
Electrochemical Cells ◽  
Phenothiazine Derivative ◽  
Light Emitting

Electroluminescence of the sulfone form of phenothiazine derivative was tuned to blue emission from green emission in the sulfide form.

An ester-substituted polyfluorene derivative for light-emitting electrochemical cells: bright blue emission and its application in a host–guest system

2018 ◽  
Vol 2 (5) ◽  
pp. 952-958 ◽  
Author(s):  
Go Nagatsu ◽  
Tomo Sakanoue ◽  
Shizuka Tane ◽  
Fumihiro Yonekawa ◽  
Taishi Takenobu
Keyword(s):  
Ionic Liquid ◽  
Blue Emission ◽  
Bright Light ◽  
Electrochemical Cells ◽  
Light Emitting ◽  
System P ◽  
Guest System ◽  
Bright Blue

Ester substitution realized phase compatible film blends of a polymer and an ionic liquid for bright light-emitting electrochemical cells.

Novel Thenil-Based Ionic Small Molecules for Nondoped Light-Emitting Electrochemical Cells for Ultrapure Green Emission

2021 ◽  
Author(s):  
Jino C. John ◽  
Kanagaraj Shanmugasundaram ◽  
C. V. S. Brahmmananda Rao ◽  
Gopinadhanpillai Gopakumar ◽  
Youngson Choe
Keyword(s):  
Small Molecules ◽  
Green Emission ◽  
Electrochemical Cells ◽  
Light Emitting

scholarly journals A Highly Efficient White Luminescent Zinc (II) Based Metallopolymer by RGB Approach

Polymers ◽  
2019 ◽  
Vol 11 (10) ◽  
pp. 1712 ◽  
Author(s):  
Barbara Panunzi ◽  
Rosita Diana ◽  
Ugo Caruso
Keyword(s):  
Thin Films ◽  
Ionic Liquid ◽  
Organic Solvents ◽  
Light Emitting Diodes ◽  
Blue Emission ◽  
Quantum Yields ◽  
Electrochemical Cells ◽  
Active Materials ◽  
Tridentate Ligands ◽  
Light Emitting

Three aryl-hydrazone O,N,O tridentate ligands with a different electron-withdrawing substituent were prepared. The introduction of a flexible charged chain in the ligands guaranteed solubility in many organic solvents and in water. The increasing withdrawing aptitude of the substituents red-shifted the emission in the correspondent metallopolymers. The metallated polymers were obtained by grafting ligand-zinc (II) coordination fragments onto commercial poly-(4-vinylpyridine). Metallopolymers thin films exhibited red, green and blue emission colors defined by Commission Internationale d’Eclairage (CIE) coordinates and medium to excellent photoluminescence (PL) quantum yields (PLQYs) comparable with other highly-performing active materials for Light-Emitting Diodes (LEDs). By grafting a suitable mix of the three different coordination pendants, an efficient single-component white emissive metallopolymer with CIE (0.30, 0.31) was prepared. Thanks to the charged moiety, the polymers resulted miscible with an ionic liquid. The addition produced homogeneous polymeric layers with unaltered PL performances, potentially employable in Light-emitting Electrochemical Cells (LECs).

Luminescence Properties of Ce3+ and Tb3+ Doped Strontium Pyroborate Phosphors

2012 ◽  
Vol 502 ◽  
pp. 140-143
Author(s):  
Jia Yue Sun ◽  
Jin Li Lai ◽  
Yi Ning Sun ◽  
Zhi Guo Xia ◽  
Hai Yan Du
Keyword(s):  
Uv Light ◽  
Blue Emission ◽  
Green Emission ◽  
Luminescent Properties ◽  
Excitation Spectra ◽  
Solid State Method ◽  
Light Emitting ◽  
Near Ultraviolet ◽  
White Light Emitting Diodes ◽  
Co Doped

Ce3+ and Tb3+ co-doped Strontium Pyroborate phosphors were synthesized by the solid-state method. The luminescent properties of phosphors were investigated by using the photoluminescence emission and excitation spectra. Under the excitation of near ultraviolet (n-UV) light, Ce3+ and Tb3+ co-doped Strontium Pyroborate phosphors exhibited blue emission corresponding to the f-d transition of Ce3+ ions and green emission bands corresponding to the f-f transition of Tb3+ ions, respectively. In the Ce3+ and Tb3+ co-activated samples the Ce3+ ions strongly sensitize the luminescence of the Tb ions. The Ce3+ and Tb3+ co-doped Strontium Pyroborate phosphor could be considered as one of double emission phosphor for n-UV excited white light emitting diodes.

White-Light-Emitting Phosphate Phosphors of SrZn2(PO4)2: Eu2+, Mn2+ Synthesized through Combustion Process

2011 ◽  
Vol 688 ◽  
pp. 344-348
Author(s):  
Xiao Song Yan ◽  
Wan Wan Li ◽  
Kang Sun
Keyword(s):  
Emission Band ◽  
Combustion Process ◽  
Blue Emission ◽  
Green Emission ◽  
Mixture Ratio ◽  
Blue Emission Band ◽  
Light Emitting ◽  
Green Emission Band ◽  
Emission Color ◽  
Emission Light

The SrZn2(PO4)2: Eu2+, Mn2+ phosphors were synthesized through combustion process with varying mixture ratio of Eu2+, Mn2+. The SrZn2(PO4)2: Eu2+, Mn2+ phosphor presents three emission bands under 365nm radiation: the blue emission band of 416 nm from Eu2+ occupying the Sr2+ site, the green emission band of 538 nm and the red emission band of 630 nm from Mn2+ occupying two different Zn2+ sites. Compared with the SrZn2(PO4)2: Eu2+, Mn2+ phosphor prepared through solid state reaction, the luminous intensity of the phosphor is greatly improved through the combustion reaction. White emission light with a high color rending index of 84.7 can be obtained from the phosphor of SrZn2(PO4)2: Eu2+, Mn2+, and the emission color tone of the phosphor varies from blue, white, and finally yellow by increasing the ratio of the concentrations of Eu2+ and Mn2+.

Single Molecule Solid State Light Emitting Electrochemical Cells with Lifetimes Superior to 3000 Hours

2008 ◽  
Author(s):  
Henk Bolink ◽  
Rubén D. Costa ◽  
Enrique Orti ◽  
Michele Sessolo ◽  
Stefan Graber ◽  
...  
Keyword(s):  
Solid State ◽  
Single Molecule ◽  
Electrochemical Cells ◽  
Light Emitting

A versatile structure of light-emitting electrochemical cells for printed electronics

2020 ◽  
Vol 13 (8) ◽  
pp. 084002
Author(s):  
Yuki Tanaka ◽  
Jiang Pu ◽  
Taishi Takenobu
Keyword(s):  
Printed Electronics ◽  
Electrochemical Cells ◽  
Light Emitting

scholarly journals Polymer Thermal Treatment Production of Cerium Doped Willemite Nanoparticles: An Analysis of Structure, Energy Band Gap and Luminescence Properties

Materials ◽  
2021 ◽  
Vol 14 (5) ◽  
pp. 1118
Author(s):  
Ibrahim Mustapha Alibe ◽  
Khamirul Amin Matori ◽  
Mohd Hafiz Mohd Zaid ◽  
Salisu Nasir ◽  
Ali Mustapha Alibe ◽  
...  
Keyword(s):  
Solid State ◽  
Thermal Treatment ◽  
Band Gap ◽  
Optical Band Gap ◽  
Dopant Concentration ◽  
Blue Emission ◽  
Green Emission ◽  
Band Gap Energy ◽  
Solid State Lighting ◽  
Gap Energy

The contemporary market needs for enhanced solid–state lighting devices has led to an increased demand for the production of willemite based phosphors using low-cost techniques. In this study, Ce3+ doped willemite nanoparticles were fabricated using polymer thermal treatment method. The special effects of the calcination temperatures and the dopant concentration on the structural and optical properties of the material were thoroughly studied. The XRD analysis of the samples treated at 900 °C revealed the development and or materialization of the willemite phase. The increase in the dopant concentration causes an expansion of the lattice owing to the replacement of larger Ce3+ ions for smaller Zn2+ ions. Based on the FESEM and TEM micrographs, the nanoparticles size increases with the increase in the cerium ions. The mean particles sizes were estimated to be 23.61 nm at 1 mol% to 34.02 nm at 5 mol% of the cerium dopant. The optical band gap energy of the doped samples formed at 900 °C decreased precisely by 0.21 eV (i.e., 5.21 to 5.00 eV). The PL analysis of the doped samples exhibits a strong emission at 400 nm which is ascribed to the transition of an electron from localized Ce2f state to the valence band of O2p. The energy level of the Ce3+ ions affects the willemite crystal lattice, thus causing a decrease in the intensity of the green emission at 530 nm and the blue emission at 485 nm. The wide optical band gap energy of the willemite produced is expected to pave the way for exciting innovations in solid–state lighting applications.

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