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.

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.

A New Salt-Inclusion Single-Phased White Phosphor Ba7B3SiO13Br:Dy3+ for White Light-Emitting Diodes

2019 ◽  
Vol 803 ◽  
pp. 93-97
Author(s):  
Hai Dong Ju ◽  
Bao Ling Wang ◽  
Qi Mei Yang
Keyword(s):  
White Light ◽  
Emission Band ◽  
Light Emitting Diodes ◽  
Hexagonal Phase ◽  
Blue Emission ◽  
Yellow Emission ◽  
Conventional Solid State Reaction ◽  
Blue Emission Band ◽  
Light Emitting ◽  
White Light Emitting Diodes

A series of Ba7B3SiO13Br:Dy3+ phosphors were synthesized by a conventional solid-state reaction method for the first time. The X-ray diffraction patterns confirmed that the samples were pure phase and crystallized in a hexagonal phase with a space group of the P63mc (186). The luminescence spectrum exhibited a strong blue emission band peaked at 478 nm, a strong yellow emission band at 575 nm and a weak emission band at 665 nm, corresponding to the transitions from 4F9/2 to 6H15/2, 6H13/2 and 6H13/2 of Dy3+, respectively. According to the emission spectrum of Ba6.92B3SiO13Br:0.08Dy3+ excited at 349 nm, the chromaticity coordinate was calculated to be (0.317, 0.358) located on the white light region. The concentration quenching mechanism of Dy3+ in Ba7B3SiO13Br was ascribed to the multipolar-multipolar interaction. The current researches suggested that the phosphor can be used as a white phosphor suitable for white light-emitting diodes.

Combustion synthesis and luminescent properties of green-emitting phosphor (Sr, Zn) Al2O4: Eu2+, B3+ for white light emitting diodes (WLED)

Open Physics ◽  
2009 ◽  
Vol 7 (1) ◽  
Author(s):  
Shan-Shan Yao ◽  
Yuan-Yuan Li ◽  
Dong-Hua Chen ◽  
Wan-Jun Tang ◽  
Yu-Hua Peng
Keyword(s):  
White Light ◽  
Combustion Temperature ◽  
Light Emitting Diodes ◽  
Blue Emission ◽  
Particle Morphology ◽  
Luminescent Properties ◽  
Combustion Method ◽  
Light Emitting ◽  
Zn Concentration ◽  
White Light Emitting Diodes

AbstractIn this study, the phosphors (Sr1−x , Znx)0.9(Al2−y , By)O4 doped 10 mol % Eu2+, were prepared by combustion method as the fluorescent material for white light emitting diodes (WLEDs), performing as a light source. The luminescent properties were investigated by changing the combustion temperature, the boron concentration, and the ratio of Sr to Zn. The luminescence, crystallinity and particle morphology were investigated by using a luminescence spectrometer, X-ray diffractometer (XRD) and transmission electron microscopy (TEM), respectively. The highest intensity of Sr0.9(Al2−y , By)O4: Eu0.12+ phosphor was achieved when the combustion temperature was 600° and the concentration of B3+ was 8 mol % of the aluminate. A new blue emission was observed when the high Zn concentration (x ⩾ 0.8), and this blue emission disappeared with the Zn concentration became lower than 0.8. The combustion method synthesized phosphor (Sr0.6, Zn0.4)0.9(Al1.92, B0.08)O4: Eu0.12+ showed 3.3 times improved emission intensity compared with that of the Sr0.9(Al1.92, B0.08)O4:Eu0.12+ phosphor under λex = 390 nm.

A New Blue-Emitting Mg2Al4Si5O18:Ce3+ Phosphor for White Light Emitting Diodes

2016 ◽  
Vol 16 (4) ◽  
pp. 3506-3510 ◽  
Author(s):  
Jian Chen ◽  
Hongyun Ma ◽  
Yangai Liu
Keyword(s):  
Thermal Stability ◽  
White Light ◽  
Light Emitting Diodes ◽  
Broad Band ◽  
Blue Emission ◽  
Solid State Reaction Method ◽  
Light Emitting ◽  
Good Thermal Stability ◽  
Near Ultraviolet ◽  
White Light Emitting Diodes

A series of blue-emitting Mg2Al4Si5O18:Ce3+ phosphors were prepared via the conventional high temperature solid-state reaction method. The phase structure, photoluminescence (PL) properties, PL thermal stability, and fluorescence decay curves of the samples were investigated for the first time. Under excitation at 365 nm, the phosphor exhibited a broad band blue emission with peak at 440 nm, which was ascribed to the 4f → 5d transition of Ce3+, and the color coordinate was (0.1602, 0.0849). When the temperature increased to 150 °C, the luminescence intensity of the Mg2Al4Si5O18:0.06Ce3+ phosphor was 55.73% of the initial value at room temperature. The activation energy ΔE was calculated to be 0.25 eV, which proved the good thermal stability of the sample. The energy transfer critical distance between Ce3+ ions in Mg2Al4Si5O18 host were also calculated. The above results indicate that the Mg2Al4Si5O18:Ce3+ is a promising candidate as a blue-emitting near ultraviolet convertible phosphor for application in white light emitting diodes (WLEDs).

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).

Eu2+-Doped NaBa4(AlB4O9)2X3 (X = Cl, Br) phosphors with intense two-center blue emission and high color purity for n-UV pumped white light-emitting diodes

2016 ◽  
Vol 4 (34) ◽  
pp. 7959-7965 ◽  
Author(s):  
Zhipeng Lian ◽  
Qingfeng Yan
Keyword(s):  
Quantum Efficiency ◽  
White Light ◽  
Light Emitting Diodes ◽  
Blue Emission ◽  
Color Purity ◽  
High Quantum Efficiency ◽  
Light Emitting ◽  
High Quantum ◽  
White Light Emitting Diodes ◽  
High Color Purity

Highly efficient blue-emitting NaBa4(AlB4O9)2X3 (X = Cl, Br):Eu2+ phosphors exhibit high quantum efficiency and better color purity than BAM:Eu2+.

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.

Ag-CsPbBr3 quantum dots/PMMA composite film for tunable white light emitting diodes

2021 ◽  
pp. 130691
Author(s):  
Yangyang Shen ◽  
Xiaolian Yan ◽  
Siqi Ni ◽  
Hongji Zhang ◽  
Haitao Liu ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Composite Film ◽  
White Light ◽  
Light Emitting Diodes ◽  
Light Emitting ◽  
White Light Emitting Diodes ◽  
Cspbbr3 Quantum Dots
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