Large Area Polymer Composite Films Embedded with Colloidal Quantum Dots for Efficient White Light Generation

2017 ◽  
Vol 215 (10) ◽  
pp. 1700644 ◽  
Author(s):  
Kang-Bin Bae ◽  
Won-Wook Lee ◽  
Hyeon-Yong Song ◽  
Jin-Hyeon Yun ◽  
Alexander Y. Polyakov ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Polymer Composite ◽  
White Light ◽  
Composite Films ◽  
Colloidal Quantum Dots ◽  
Large Area ◽  
White Light Generation ◽  
Light Generation

scholarly journals Configuration- and concentration-dependent hybrid white light generation using red, green, and blue quantum dots embedded in DNA thin films

2019 ◽  
Vol 1 (2) ◽  
pp. 602-612 ◽  
Author(s):  
Velu Arasu ◽  
Deoksu Jo ◽  
Heeyeop Chae ◽  
Ho Kyoon Chung ◽  
Sung Ha Park
Keyword(s):  
Thin Films ◽  
Quantum Dots ◽  
White Light ◽  
Optoelectronic Device ◽  
Excitation Source ◽  
White Light Generation ◽  
Light Generation

A simple and hybrid white-light optoelectronic device with a single excitation source with efficient RGB colours on a stable optical platform was demonstrated.

Electroluminescence Devices from Quantum Dots with TPD Polymer White Light Generation

2017 ◽  
Vol 48 ◽  
pp. 104-113 ◽  
Author(s):  
M.K. Akeel ◽  
Omar A. Ibrahim ◽  
Wasan R. Saleh
Keyword(s):  
Quantum Dots ◽  
White Light ◽  
Color Temperature ◽  
Organic Polymer ◽  
Broad Emission Band ◽  
Output Current ◽  
White Light Generation ◽  
Ito Glass ◽  
Hybrid Junction ◽  
Light Generation

Quantum dots of CdSe, CdS and ZnS QDs were prepared by chemical reaction and used to fabricate organic quantum dot hybrid junction device. QD-LEDs were fabricated using ITO/TPD: PMMA/CdSe/Al, ITO/TPD: PMMA/CdS/Al and ITO/TPD: PMMA/ZnS/Al QDs devices which synthesized by phase segregation method. The hybrid white light emitting devices consists, of two-layers deposited successively on the ITO glass substrate; the first layer was of N, N’-bis (3-methylphenyl)-N, N’-bis (phenyl) benzidine (TPD) polymer mixed with polymethyl methacrylate (PMMA) polymers in ratio 1:1, while the second layer was 0.5wt% from each type of the (CdSe, CdS and ZnS) QDs for each device.The optical properties of QDs were characterized by UV-Vis. and photoluminescence (PL) spectrometer. The results show that the prepared QDs were nanocrystalline with defects formation. The Eg calculated from PL were 2.38, 2.69 and 3.64 eV for CdSe, CdS and ZnS respectively. The generated white light properties with acceptable efficiency using confinement effect that makes the energy gap larger, thus the direction of the light sites are toward the centre of white light color.The hybrid junction devices (EL devices) were characterized by room temperature PL and electroluminescence (EL). Current-voltage (I–V) characteristics indicate that the output current is good compared to the few voltages ( 8-11.5 V) used which gives acceptable results to get a generation of white light. The EL spectrum reveals a broad emission band covering the range from 350 - 700 nm. The emissions causing this white luminescence were identified depending on the chromaticity coordinates (CIE 1931). The correlated color temperature (CCT) was found to be about 5500, 4885 and 3400K respectively. Fabrication of EL-devices from semiconductors material (CdSe, CdS and ZnS QDs) with hole injection organic polymer (TPD) was effective in white light generation. The recombination processes and I-V characteristics gives rises to the output current is good compared to the few voltages used which gives acceptable results to get a generation of white light.

Physical Insights into Facilitation of an Unprecedented Complexation Reaction on the Surface of a Doped Quantum Dot Leading to White Light Generation

2021 ◽  
Author(s):  
Sabyasachi Pramanik ◽  
Mihir Manna ◽  
Biswajit Hudait ◽  
Shilaj Roy ◽  
Satyapriya Bhandari
Keyword(s):  
Quantum Dot ◽  
White Light ◽  
Complexation Reaction ◽  
Environmentally Sustainable ◽  
White Light Generation ◽  
Light Generation

Herein we report a complexation reaction between Zn2+ ions, being present on the surface of an orange-red emitting environmentally sustainable Mn2+-doped ZnS QD, and non-emitting copper quinolate complex (CuQ2 complex),...

Efficient white light generation from 2,3-diphenyl-1,2-dihydro-quinoxaline complex

2010 ◽  
Vol 101 (3) ◽  
pp. 639-642 ◽  
Author(s):  
Y. Dwivedi ◽  
S. Kant ◽  
R. N. Rai ◽  
S. B. Rai
Keyword(s):  
White Light ◽  
White Light Generation ◽  
Light Generation
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