scholarly journals New Unsymmetrically Substituted Benzothiadiazole-Based Luminophores: Synthesis, Optical, Electrochemical Studies, Charge Transport, and Electroluminescent Characteristics

Molecules ◽  
2021 ◽  
Vol 26 (24) ◽  
pp. 7596
Author(s):  
Pavel S. Gribanov ◽  
Dmitry A. Loginov ◽  
Dmitry A. Lypenko ◽  
Artem V. Dmitriev ◽  
Sergey I. Pozin ◽  
...  
Keyword(s):  
Quantum Yield ◽  
Charge Transport ◽  
Active Transport ◽  
Cross Coupling ◽  
Luminous Efficiency ◽  
Charge Carriers ◽  
Quantum Yields ◽  
Electrochemical Studies ◽  
Light Emitting ◽  
Photoluminescence Quantum Yield

Three new benzothiadiazole (BTD)-containing luminophores with different configurations of aryl linkers have been prepared via Pd-catalyzed cross-coupling Suzuki and Buchwald–Hartwig reactions. Photophysical and electroluminescent properties of the compounds were investigated to estimate their potential for optoelectronic applications. All synthesized structures have sufficiently high quantum yields in film. The BTD with aryl bridged carbazole unit demonstrated the highest electrons and holes mobility in a series. OLED with light-emitting layer (EML) based on this compound exhibited the highest brightness, as well as current and luminous efficiency. The synthesized compounds are not only luminophores with a high photoluminescence quantum yield, but also active transport centers for charge carriers in EML of OLED devices.

Room temperature synthesis of Sn2+ doped highly luminescent CsPbBr3 quantum dots for high CRI white light-emitting diodes

Nanoscale ◽  
2021 ◽  
Author(s):  
Dongdong Yan ◽  
Qionghua Mo ◽  
Shuangyi Zhao ◽  
Wensi Cai ◽  
Zhigang Zang
Keyword(s):  
Quantum Dots ◽  
Quantum Yield ◽  
White Light ◽  
Room Temperature ◽  
Temperature Synthesis ◽  
Light Emitting ◽  
Photoluminescence Quantum Yield ◽  
Hot Injection ◽  
White Light Emitting Diodes ◽  
Cspbbr3 Quantum Dots

With a high photoluminescence quantum yield (PLQY) being able to exceed 90% for those prepared by hot injection method, CsPbBr3 quantum dots (QDs) have attracted intensive attentions for white light-emitting...

scholarly journals Air stable and highly efficient Bi3+-doped Cs2SnCl6 for blue light-emitting diodes

RSC Advances ◽  
2021 ◽  
Vol 11 (42) ◽  
pp. 26415-26420
Author(s):  
Yue Yao ◽  
Si-Wei Zhang ◽  
Zijian Liu ◽  
Chun-Yun Wang ◽  
Ping Liu ◽  
...  
Keyword(s):  
Quantum Yield ◽  
Blue Light ◽  
Light Emitting Diodes ◽  
Light Emitting ◽  
Color Coordinates ◽  
Blue Led ◽  
Highly Efficient ◽  
Photoluminescence Quantum Yield ◽  
Long Life

A Bi3+-doped Cs2SnCl6 exhibits photoluminescence at around 456 nm and a photoluminescence quantum yield of 31%. The blue LED based on the Bi3+-doped Cs2SnCl6 phosphor exhibits a long life of 120 hours and a CIE color coordinates of (0.14, 0.11).

scholarly journals Highly compact CsPbBr3 perovskite film decorated by PEO for light-emitting diodes

2018 ◽  
Vol 53 ◽  
pp. 01035
Author(s):  
Shulv Zhang ◽  
Yuhang Yin ◽  
Weiling Luan ◽  
Mengke Liu
Keyword(s):  
Surface Roughness ◽  
Quantum Yield ◽  
Polyethylene Oxide ◽  
Radiative Recombination ◽  
Light Emitting Diodes ◽  
Protective Layer ◽  
Precursor Solution ◽  
Light Emitting ◽  
Photoluminescence Quantum Yield ◽  
Crystal Boundaries

Inorganic perovskite light-emitting diodes (PeLEDs) with full coverage and compact films were realized by doping a certain amount of PEO into perovskite emitting layer. The additive PEO (Polyethylene oxide) can not only improve the coverage of films by physically filling the pin-holes of crystal boundaries but also act as a protective layer to passivate the films, which successfully reduce the rate of non-radiative recombination, and enhance photoluminescence quantum yield (PLQY) of the CsPbBr3 films. In addition, PEO can also decrease the surface roughness of the perovskite films. As a result, the addition of PEO can improve the transport capability of carriers in PeLEDs. By optimizing the concentration of PEO, a maximum external quantum efficiency (EQE) of 0.26% and brightness of 1432 cd/m2 were achieved, which is significantly improved compared with previous work. The results presented in this paper shows that the additive PEO in perovskite precursor solution paves a new way for the application in PeLEDs.

Solid-state thiolate-stabilized copper nanoclusters with ultrahigh photoluminescence quantum yield for white light-emitting devices

Nanoscale ◽  
2020 ◽  
Vol 12 (29) ◽  
pp. 15791-15799 ◽  
Author(s):  
Hao-Hua Deng ◽  
Qiong-Qiong Zhuang ◽  
Kai-Yuan Huang ◽  
Paramasivam Balasubramanian ◽  
Zhen Lin ◽  
...  
Keyword(s):  
Solid State ◽  
Quantum Yield ◽  
White Light ◽  
Copper Nanoclusters ◽  
Light Emitting ◽  
Aggregation Induced Emission ◽  
Emission Properties ◽  
Light Emitting Devices ◽  
Photoluminescence Quantum Yield

White-light-emitting devices are successfully fabricated by using solid-state copper nanoclusters as the sole phosphors with aggregation-induced emission properties.

Platinum-Functionalized Chiral Molecular Squares as Light-Emitting Materials

2004 ◽  
Vol 846 ◽  
Author(s):  
Lin Zhang ◽  
Yu-Hua Niu ◽  
Alex K.-Y. Jen ◽  
Wenbin Lin
Keyword(s):  
Mass Spectrometry ◽  
Luminous Efficiency ◽  
Quantum Yields ◽  
Bridging Ligands ◽  
Maximum Brightness ◽  
Light Emitting ◽  
Visible Luminescence ◽  
Molecular Squares ◽  
Uv Visible ◽  
C Nmr

ABSTRACTA family of new chiral metallocycles based on Pt(II) diimine metallocornors and bis(acetylene) bridging ligands have been synthesized, and characterized by a variety of techniques including 1H and 13C NMR, UV-visible, luminescence, infrared, and circular dichroism (CD) spectroscopies, and mass spectrometry. All metallocycles exhibit very strong phosphorescence with quantum yields of 8.3 to 15.7%. Chiral Pt(II)-based molecular squares were used as the light-emitting layer in multiplayer devices, and a maximum brightness of 5470 cd/m2 with a maximum luminous efficiency of 0.93 cd/A was achieved.

Quantification of Anisotropy-Related Uncertainties in Relative Photoluminescence Quantum Yield Measurements of Nanomaterials – Semiconductor Quantum Dots and Rods

2015 ◽  
Vol 229 (1-2) ◽  
Author(s):  
Christian Würth ◽  
Daniel Geißler ◽  
Ute Resch-Genger
Keyword(s):  
Quantum Dots ◽  
Quantum Yield ◽  
Semiconductor Quantum Dots ◽  
Quantum Yields ◽  
Photoluminescence Quantum Yield

AbstractIn order to assess the anisotropy-related uncertainties of relatively determined photoluminescence quantum yields (

scholarly journals Ceramic-like stable CsPbBr3 nanocrystals encapsulated in silica derived from molecular sieve templates

2020 ◽  
Vol 11 (1) ◽  
Author(s):  
Qinggang Zhang ◽  
Bo Wang ◽  
Weilin Zheng ◽  
Long Kong ◽  
Qun Wan ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
High Temperature ◽  
Hydrochloric Acid ◽  
Quantum Yield ◽  
Molecular Sieve ◽  
Green Phosphor ◽  
Light Emitting ◽  
Photoluminescence Quantum Yield ◽  
Acid Aqueous Solution ◽  
Exceptional Stability

AbstractAchieving good stability while maintaining excellent properties is one of the main challenges for enhancing the competitiveness of luminescent perovskite CsPbX3 (X=Cl, Br, I) nanocrystals (NCs). Here, we propose a facile strategy to synthesize ceramic-like stable and highly luminescent CsPbBr3 NCs by encapsulating them into silica derived from molecular sieve templates at high temperature (600–900 oC). The obtained CsPbBr3-SiO2 powders not only show high photoluminescence quantum yield (~71%), but also show an exceptional stability comparable to the ceramic Sr2SiO4:Eu2+ green phosphor. They can maintain 100% of their photoluminescence value under illumination on blue light-emitting diodes (LEDs) chips (20 mA, 2.7 V) for 1000 h, and can also survive in a harsh hydrochloric acid aqueous solution (1 M) for 50 days. We believe that the above robust stabilities will significantly enhance the potential of perovskite CsPbX3 NCs to be practically applied in LEDs and backlight displays.

scholarly journals Standards for photoluminescence quantum yield measurements in solution (IUPAC Technical Report)

2011 ◽  
Vol 83 (12) ◽  
pp. 2213-2228 ◽  
Author(s):  
Albert M. Brouwer
Keyword(s):  
Quantum Yield ◽  
Future Development ◽  
Recent Literature ◽  
Quantum Yields ◽  
Dilute Solutions ◽  
Large Group ◽  
Near Ir ◽  
Photoluminescence Quantum Yield ◽  
Technical Report ◽  
Spectral Ranges

The use of standards for the measurement of photoluminescence quantum yields (QYs) in dilute solutions is reviewed. Only three standards can be considered well established. Another group of six standards has been investigated by several independent researchers. A large group of standards is frequently used in recent literature, but the validity of these is less certain. The needs for future development comprise: (i) confirmation of the validity of the QY values of many commonly used standard materials, preferably in the form of SI traceable standards; (ii) extension of the set of standard materials to the UV and near-IR spectral ranges; and (iii) good standards or robust protocols for the measurements of low QYs.

scholarly journals A Versatile Tripodal Ligand for Sensitizing Lanthanide (LnIII) Ions and Color Tuning

Chemistry ◽  
2021 ◽  
Vol 3 (1) ◽  
pp. 138-145
Author(s):  
Rodney A. Tigaa ◽  
Raul E. Ortega ◽  
Xinsong Lin ◽  
Geoffrey F. Strouse
Keyword(s):  
Quantum Yield ◽  
Metal Complexes ◽  
White Light ◽  
Single Component ◽  
Quantum Yields ◽  
Color Tuning ◽  
Tripodal Ligand ◽  
Light Emitting ◽  
The Absolute ◽  
White Material

Lanthanide (LnIII) ions were successfully chelated and sensitized with a tripodal ligand. The absolute LnIII-centered emission efficiencies were ~3% for both the europium(III) (EuIII) and terbium (TbIII) complexes and up to 54% for the cerium(III) (CeIII) complex. The differences in emission quantum yields for the early lanthanides (CeIII) and the mid lanthanides (EuIII and TbIII) were attributed to their d–f and f–f nature, respectively. Despite the low quantum yield of the EuIII complex, the combination of the residual ligand fluorescence and the red EuIII emission resulted in a bluish-white material with the Commission Internationale de l’Eclairage (CIE) coordinates (0.258, 0.242). Thus, metal complexes of the ligand could be used in the generation of single-component white-light-emitting materials.

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