scholarly journals Aqueous Synthesis of ZnSe/ZnS-2-R-Benzothiazole Nanocrystals with White Emission

2016 ◽  
Vol 2016 ◽  
pp. 1-9
Author(s):  
Ying-Fan Liu ◽  
Yan-Hui Zhang ◽  
Guo-Qing Wang ◽  
Kai-Ming Mao ◽  
Shao-Ming Fang ◽  
...  
Keyword(s):  
White Light ◽  
Light Emitting Diodes ◽  
Water Soluble ◽  
Quantum Yields ◽  
Aqueous Synthesis ◽  
Light Emitting ◽  
White Emission ◽  
White Light Emitting Diodes ◽  
Nm Range

We prepared water-soluble white light-emitting ZnSe/ZnS-2-R-benzothiazole nanocrystals (NCs), R = 2-hydroxy-5-(2,5-dimethyl-thienyl)-phenyl. The penicillamine (Pen) capped ZnSe/ZnS NCs were firstly prepared with high photoluminescence quantum yields (PL QY) of 40%. Then they bond to 2-R-benzothiazole molecules, resulting in white light-emitting ZnSe/ZnS-2-R-benzothiazole NCs with QY of 75% over a 375 to 650 nm range of emission, which can be applied to white light-emitting diodes. The ZnSe/ZnS-2-R-benzothiazole NCs with two emission bands at around 451 and 557 nm were discussed and the possible mechanism of the interaction of ZnSe/ZnS NCs with 2-R-benzothiazole was also proposed.

scholarly journals Solvent regulation synthesis of single-component white emission carbon quantum dots for white light-emitting diodes

2021 ◽  
Vol 10 (1) ◽  
pp. 465-477
Author(s):  
Longshi Rao ◽  
Qing Zhang ◽  
Mingfu Wen ◽  
Zhongfa Mao ◽  
Huaxian Wei ◽  
...  
Keyword(s):  
Quantum Dots ◽  
White Light ◽  
Light Emitting Diodes ◽  
Carbon Quantum Dots ◽  
Single Component ◽  
Great Promise ◽  
Solvent Engineering ◽  
Light Emitting ◽  
White Emission ◽  
White Light Emitting Diodes

Abstract White light-emitting diodes (WLEDs) hold great promise in lighting, display, and visible light communication devices, and single-component white emission carbon quantum dots (SCWE-CQDs) as the key component of WLEDs have many outstanding advantages. However, rapid and efficient synthesis of SCWE-CQDs with high photoluminescence quantum yield (PLQY) and stability remains challenging. Here, we report a novel solvent engineering strategy to obtain highly photoluminescent SCWE-CQDs by controlling the dilution ratios between N,N-dimethylformamide (DMF) and pristine red carbon quantum dots (RCQDs) solution. By optimizing synthesis conditions, the relative PLQY of the SCWE-CQDs solution reached 53%. Morphological, structural, and optical property characterizations indicate that the combined action of the hydrogen bond (HB) effect and the size effect leads to the blue shift of RCQDs, but the HB effect is more dominant than the particle size in causing large spectral shifts. In addition, the WLEDs with high color rendering index of 89 and remarkable reliability were obtained based on the highly photoluminescent SCWE-CQDs. This facile solvent engineering approach for synthesizing tunable emission CQDs will promote the progress of carbon-based luminescent materials for applications in optoelectronic devices.

Highly efficient and thermally stable single-activator white-emitting phosphor K2Ca(PO4)F:Eu2+ for white light-emitting diodes

2019 ◽  
Vol 7 (29) ◽  
pp. 8982-8991 ◽  
Author(s):  
Ying Li ◽  
Zhongxian Qiu ◽  
Jilin Zhang ◽  
Xiaoyu Ji ◽  
Xinguo Zhang ◽  
...  
Keyword(s):  
White Light ◽  
Light Emitting Diodes ◽  
Thermally Stable ◽  
Light Emitting ◽  
White Emission ◽  
Highly Efficient ◽  
White Light Emitting Diodes

Highly efficient and stable white emission is realized in a single-doped K2Ca(PO4)F:Eu2+ phosphor with Eu2+ on both K+ and Ca2+ sites.

Aggregation-induced white emission of lanthanide metallopolymer and its coating on cellulose nanopaper for white-light softening

2020 ◽  
Vol 8 (6) ◽  
pp. 2205-2210 ◽  
Author(s):  
Zhao Zhang ◽  
Yanxin Chen ◽  
Hui Chang ◽  
Yaoyu Wang ◽  
Xinping Li ◽  
...  
Keyword(s):  
White Light ◽  
Light Emitting Diodes ◽  
Light Emitting ◽  
White Emission ◽  
Cellulose Nanopaper ◽  
White Light Emitting Diodes

AIE-active lanthanide metallopolymer coated on an optical haze nanopaper for application in soft-white-light emitting diodes (SWLEDs).

The application of Zn0.8Cd0.2S nanocrystals in white light emitting diodes devices

RSC Advances ◽  
2015 ◽  
Vol 5 (106) ◽  
pp. 87667-87671 ◽  
Author(s):  
Ya-Ching Chen ◽  
Cyuan-Bin Siao ◽  
Hong-Shuo Chen ◽  
Kuan-Wen Wang ◽  
Shu-Ru Chung
Keyword(s):  
White Light ◽  
Light Emitting Diodes ◽  
Quantum Yields ◽  
Light Emitting ◽  
High Quantum ◽  
Ternary Semiconductor ◽  
White Light Emitting Diodes

In this study, colloidal ternary semiconductor Zn0.8Cd0.2S (ZnCdS) nanocrystals (NCs) with wide emission and high quantum yields (QYs) have been prepared and used as nanophosphors in white light emitting diodes (WLEDs).

scholarly journals Stable blue-emissive aluminum acetylacetonate nanocrystals with high quantum yield of over 80% and embedded in polymer matrix for remote UV-pumped white light–emitting diodes

Nanophotonics ◽  
2020 ◽  
Vol 9 (6) ◽  
pp. 1509-1518
Author(s):  
Hong Zheng ◽  
Bingkun Chen ◽  
Lifu Shi ◽  
Fa Zhang ◽  
Ziheng Zhao ◽  
...  
Keyword(s):  
Composite Film ◽  
White Light ◽  
Light Emitting Diodes ◽  
Composite Films ◽  
Blue Emission ◽  
Quantum Yields ◽  
Aluminum Compound ◽  
Light Emitting ◽  
Air Atmosphere ◽  
White Light Emitting Diodes

AbstractBlue-emissive nanocrystals (NCs) with high photoluminescence quantum yields (PL QYs) and excellent stability are essential for lighting and displays. Here, a facile top-down approach (including two steps: thermal annealing and ultrasonic treatment) by using aluminum acetylacetonate (Al(acac)3) as a precursor is adopted to fabricate blue-emissive Al(acac)3 NCs with high PL QY reaching 81.8%, the highest reported value for the aluminum compound-based NCs so far. Additionally, the as-fabricated Al(acac)3 NC solution (in toluene) exhibits high stability under air atmosphere condition, maintaining 61.2% of initial PL QY after 1 year. Furthermore, solution-processed Al(acac)3 NCs/poly(methyl methacrylate) (PMMA) composite film with blue emission is demonstrated. Finally, combinations of the blue-emitting Al(acac)3 NCs/PMMA composite film with red-emitting and green-emitting CuInS2 composite films are realized, resulting in remote ultraviolet-pumped white light-emitting diodes with a high color rendering index of 91. These findings inform new blue-emissive NCs and composite films, potentially paving the way to design new structures of lighting and display devices.

Broadband yellow light emitting performance based on zero-dimensional hybrid lead bromide trimers

2020 ◽  
Vol 44 (48) ◽  
pp. 21146-21151
Author(s):  
Xing-Yu Sun ◽  
Wei-Feng Zhang ◽  
Hong-Mei Pan ◽  
Yue-Yu Ma ◽  
Zhi-Hong Jing
Keyword(s):  
White Light ◽  
Light Emitting Diodes ◽  
Quantum Yields ◽  
Yellow Light ◽  
Inorganic Hybrid ◽  
Light Emitting ◽  
Lead Bromide ◽  
White Light Emitting Diodes

Two new zero-dimensional organic–inorganic hybrid lead halides based on linear [Pb3Br12]6− trimers display broadband yellow light emissions with high photoluminescence quantum yields, exhibiting potential in the fabrications of white-light emitting diodes.

Free inert gas protection, low temperature, non-injection synthesis of CdS and doped quantum dots for efficient white light-emitting diodes

2017 ◽  
Vol 5 (13) ◽  
pp. 3276-3282 ◽  
Author(s):  
Yang Ding ◽  
Jie Liu ◽  
Yan Zhu ◽  
Siyang Nie ◽  
Junli Shi ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Low Temperature ◽  
White Light ◽  
Light Emitting Diodes ◽  
Inert Gas ◽  
Quantum Yields ◽  
Light Emitting ◽  
Doped Quantum Dots ◽  
White Light Emitting Diodes

Cadmium based chalcogenides quantum dots exhibited ultrahigh photoluminescence, quantum yields and multicolor luminescence.

Sign in / Sign up

Export Citation Format

Share Document