Excitation Induced Emission Color Change in Conjugated Polymers

2003 ◽  
Vol 107 (42) ◽  
pp. 11604-11607 ◽  
Author(s):  
Raoul Schroeder ◽  
James N. Wilson ◽  
Uwe H. F. Bunz ◽  
Bruno Ullrich
Keyword(s):  
Conjugated Polymers ◽  
Color Change ◽  
Emission Color

Photochromism and emission-color change in Ba3MgSi2O8-based phosphors

2016 ◽  
Vol 173 ◽  
pp. 237-242 ◽  
Author(s):  
Yoshinori Yonezaki ◽  
Shino Takei
Keyword(s):  
Color Change ◽  
Emission Color

scholarly journals New Multicolor Tungstate-Molybdate Microphosphors as an Alternative to LED Components

Materials ◽  
2021 ◽  
Vol 14 (21) ◽  
pp. 6608
Author(s):  
Justyna Czajka ◽  
Agata Szczeszak ◽  
Nina Kaczorowska ◽  
Stefan Lis
Keyword(s):  
Color Change ◽  
Emission Spectra ◽  
Luminescent Properties ◽  
Luminescence Spectroscopy ◽  
Solid State Method ◽  
Light Emitting ◽  
Tetragonal Crystal ◽  
Emission Color ◽  
The Matrix ◽  
Cie Chromaticity

Due to the ongoing need to create phosphors with the appropriate emission color for the production of light emitting diodes, we decided to synthesize a series of multicolour microphosphors with tunable visible emissions, depending on the composition of dopant ions. In this work, we investigated the structure, morphology, and luminescent properties of new molybdate–tungstate phosphors co-doped with Tb3+ and Eu3+ ions. The conventional high temperature solid state method was used to prepare a series of CaMoyW1−yO4:Eu3+x/Tb3+1−x materials. In order to obtain phosphors with the most promising luminescent properties, the experiment was planned by taking into account the different composition of the matrix and the concentration of the particular dopant ions (Eu3+x/Tb3+1−x, x = 0.001, 0.003, 0.005, 0.007, 0.009). As a result, luminescent materials were obtained with a pure tetragonal crystal structure, the space group of I41/a, confirmed by X-ray diffraction (XRD). The size and shape of the particles obtained from the materials were analyzed based on scanning electron microscopy images. Luminescence spectroscopy (excitation and emission spectra, decay lifetimes) was utilized to characterize the luminescence properties of the as-prepared phosphors. The color change of the emission from green-yellow to orange-red was confirmed using the 1931 Comission Internationale de l’Eclairage (CIE) chromaticity coordinates and color correlated temperature (CCT).

Corannulene-Based Donor-Acceptor-Type Conjugated Polymers with Electrochromic Properties

2021 ◽  
Author(s):  
Jing-Ju Huang ◽  
Hsing-An Lin ◽  
Chi Chen ◽  
Po-Wen Tang ◽  
Shyh-Chyang Luo
Keyword(s):  
Conjugated Polymers ◽  
Electron Donor ◽  
Electron Acceptor ◽  
Color Change ◽  
Material Research ◽  
Electrochromic Properties ◽  
Electrochromic Material ◽  
Wide Range ◽  
Donor Acceptor

π−Conjugated polymers have received increasing attention in electrochromic material research because their color change can be altered over a wide range by introducing electron-donor (D) and electron-acceptor (A) moieties. In...

Reversible Emission Color Change of Eu-Polymer Complex Induced by Acetone

2011 ◽  
Vol 51 (2) ◽  
pp. 235-241 ◽  
Author(s):  
Yaoming Zhang ◽  
Qihua Wang ◽  
Chao Wang ◽  
Xianqiang Pei ◽  
Tingmei Wang
Keyword(s):  
Color Change ◽  
Polymer Complex ◽  
Emission Color

Phosphor Thermometry by Using Rare Earth-Doped Yttrium Oxides

2011 ◽  
Author(s):  
Naohiro Ishiwada ◽  
Satoko Fujioka ◽  
Toshihisa Ueda ◽  
Takeshi Yokomori
Keyword(s):  
Intensity Ratio ◽  
Color Change ◽  
Thermal Quenching ◽  
Ratio Method ◽  
Temperature Dependent ◽  
Phosphor Material ◽  
Emission Color ◽  
Phosphor Thermometry ◽  
Increasing Temperature ◽  
Rare Earth Doped

The development of new temperature-dependent phosphor particles for high temperature thermometry is presented. To develop the phosphor material that can be applied to the intensity ratio method, the photoluminescence of Y2O3:Tb,Tm was investigated with elevating temperature. As a result, Y2O3:Tb,Tm phosphor shows that the peak intensity at 456 nm is still strong at more than 1100 K whereas the other peak intensities decrease due to the thermal quenching. Thus, the intensity ratio I543nm/I456nm has a high gradient and linearity over a wide temperature range, and it is confirmed that Y2O3:Tb,Tm provides a higher resolution in temperature measurement than Y2O3:Tb and Y2O3:Tm. Also, since this phosphor changes its emission color from green to blue with increasing temperature, it is possible to measure temperature not only by analyzing the intensity ratio but also by observing the color change in appearance. It can, therefore, be expected to use as a Visual Thermo-Sensor (VTS).

Synthesis and Optical Properties of a Novel Oligobipyridine

2001 ◽  
Vol 665 ◽  
Author(s):  
Y. J. Fu ◽  
T.K.S. Wong ◽  
H.X. Zhang ◽  
G. M. Wang ◽  
X. Hu ◽  
...  
Keyword(s):  
Optical Properties ◽  
Conjugated Polymers ◽  
Double Layer ◽  
Single Layer ◽  
Emission Spectra ◽  
Amorphous Film ◽  
Emission Peak ◽  
Conjugation Length ◽  
Emission Color ◽  
Film State

ABSTRACTIn this paper, 5,5' –bis [ 4'– methyl- ( 2,2'– bipyridin– 4- yl)- ethyl ]- 2,2'– bipyridine (BMBPYBPY), a partially conjugated derivative of oligobipyridine, has been synthesized and found to show strong photoluminescence (PL). Compared with the pyridine-based conjugated polymers, the shortened conjugation length shifts the emission color from green to violet-blue. The effects of morphology on its PL properties have been studied. From its as-precipitated powder state, an emission peak at 418 nm can be observed. However the emission spectra from its diffused states such as doped in KBr, or dissolved in CHCl3, as well as from its amorphous film state fabricated by vacuum evaporation are more complex. Also carried out are preliminary electroluminescent studies. Single layer devices ITO/BMBPYBPY/Al do not emit although current can be observed prominently. Double layer devices ITO/TPD/ BMBPYBPY/Al show emissions both from TPD and BMBPYBPY.

Turn-on-type emission enhancement and ratiometric emission color change based on the combination effect of aggregation and TICT found in the hexaazatriphenylene-triphenylamine dye in an aqueous environment

RSC Advances ◽  
2016 ◽  
Vol 6 (89) ◽  
pp. 86301-86308 ◽  
Author(s):  
Tsutomu Ishi-i ◽  
Yuriko Moriyama ◽  
Yutarou Kusakaki
Keyword(s):  
Color Change ◽  
Aqueous Environment ◽  
Combination Effect ◽  
Turn On ◽  
Emission Enhancement ◽  
Emission Color ◽  
Donor Acceptor

Turn-on-type emission enhancement and a ratiometric emission color change were achieved simultaneously due to the aggregation and TICT of a donor–acceptor-type dye.

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