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.

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.

Improved Yellow Light Emission in the Achievement of Dichromatic White Light Emitting Diodes

2013 ◽  
Vol 1538 ◽  
pp. 371-375
Author(s):  
Zhao Si ◽  
Tongbo Wei ◽  
Jun Ma ◽  
Ning Zhang ◽  
Zhe Liu ◽  
...  
Keyword(s):  
Blue Light ◽  
White Light ◽  
Light Emitting Diodes ◽  
Light Emission ◽  
Dual Wavelength ◽  
Emission Wavelength ◽  
White Led ◽  
Yellow Light ◽  
Light Emitting ◽  
White Light Emitting Diodes

ABSTRACTA study about the achievement of dichromatic white light-emitting diodes (LEDs) was performed. A series of dual wavelength LEDs with different last quantum-well (LQW) structure were fabricated. The bottom seven blue light QWs (close to n-GaN layer) of the four samples were the same. The LQW of sample A was 3 nm, and that of sample B, C and D were 6 nm, a special high In content ultra-thin layer was inserted in the middle of the LQW of sample C and on top of that of sample D. XRD results showed In concentration fluctuation and good interface quality of the four samples. PL measurements showed dual wavelength emitting, the blue light peak position of the four samples were almost the same, sample A with a narrower LQW showed an emission wavelength much shorter than that of sample B, C, D. EL measurement was done at an injection current of 100 mA. Sample A only showed LQW emission due to holes distribution. Because of wider LQW, the emission wavelength of sample B, C and D was longer and peak intensity was weaker. Sample D with insert layer on top of LQW showed strongest yellow light emission with a blue peak. As the injection current increased, sample A showed highest output light power due to narrower LQW. Of the other three samples with wider LQW, sample D showed highest output power. Effective yellow light emission has always been an obstacle to the achievement of dichromatic white LED. Sample D with insert layer close to p-GaN can confine the hole distribution more effectively hence the recombination of holes and electrons was enhanced, the yellow light emission was improved and dichromatic white LED was achieved.

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.

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.

Stable white photoluminescence from Mn-contained organic lead bromide perovskite ring arrays formed from 2D colloidal crystal templates

2020 ◽  
Vol 44 (32) ◽  
pp. 13619-13625
Author(s):  
Jingkun Xu ◽  
Junfeng Qu ◽  
Haibao Shao ◽  
Shuhong Xu ◽  
Chunlei Wang ◽  
...  
Keyword(s):  
White Light ◽  
Light Emitting Diodes ◽  
Light Emission ◽  
Colloidal Crystal ◽  
Light Emitting ◽  
Color Quality ◽  
Lead Bromide ◽  
Organic Lead ◽  
White Light Emitting Diodes ◽  
Controllable Size

C4N2H14PbxMn1−xBr4 perovskite ring arrays with stable white light emission and controllable size for high color quality white light-emitting diodes.

High color rendering index and stable white light emitting diodes fabricated from lead bromide perovskites

2019 ◽  
Vol 115 (15) ◽  
pp. 153103
Author(s):  
Zhiyuan Gao ◽  
Xingyi Wang ◽  
Yufei Bai ◽  
Chun Sun ◽  
Hanxin Liu ◽  
...  
Keyword(s):  
White Light ◽  
Light Emitting Diodes ◽  
Light Emitting ◽  
Lead Bromide ◽  
Color Rendering Index ◽  
White Light Emitting Diodes ◽  
Color Rendering
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