Highly Luminescent Colloidal CdS Quantum Dots with Efficient Near-Infrared Electroluminescence in Light-Emitting Diodes

Bansal, Ashu K.; Antolini, F.; Zhang, Shuyu; Stroea, Lenuta; Ortolani, Luca; Lanzi, Massimiliano; Serra, Emanuele; Allard, Sybille; Scherf, Ullrich; Samuel, Ifor D. W.

doi:10.1021/acs.jpcc.5b09109

Cited by 67 publications

(41 citation statements)

References 40 publications

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“…In laboratory, the OLED assembling process has been carried out in a glove-box system with controlled humidity and inert atmosphere to reduce these problems 9,10 . OLED devices have polymeric-organic thin films sandwiched between inorganic electrodes the deposition of these organic materials have been carried out by spin coating method with commercial spinners [11][12][13] .…”

Section: (A) (B)mentioning

confidence: 99%

Low cost spinner developed for deposition of thin films used in OLED devices

Santos

Takahashi²,

Takimoto³

et al. 2018

RBAV

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This work aims the development of a compact spinner to be used inside the glove-box chamber to deposition of polymeric thin films used in the build of OLED devices. Initially, ten fans extracted of microcomputers were tested with commercial multi-voltage power supply. Four fans were selected based on the standard deviation of speed. A variable power supply was also built in order to get a more detailed response in terms of electrical current and speed in function of applied voltage. The fan that showed less variation of speed with applied voltage was selected for deposition tests using polymeric photoresist solution on the ITO (indium tin oxide) coated glass. This polymer was deposited by spin-coating at different speeds: 1000, 2000, 3000 and 4000 rpm and dried for the thicknesses measurement revealing good uniformity. Finally, three OLED devices were assembled with 2000 and 3000 rpm and the layers were dried under the same conditions. In the structure of the devices were used the materials deposited layer-by-layer: glass/ITO/PEDOT: PSS/Polyfluorene (PFpf)/Al. The OLED devices revealed blue light electroluminescence. The I-V curves showed better performance for OLED devices mounted at 2000 rpm with higher current density and similar appearance to the diode curve.

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Section: (A) (B)mentioning

confidence: 99%

Low cost spinner developed for deposition of thin films used in OLED devices

Santos

Takahashi²,

Takimoto³

et al. 2018

RBAV

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“…Then taking into account (3), (9), (10) and (11), the energy of polarization interaction (3), may be written in the following form:…”

Section: Energy Of Ground State Exciton In Nanosystemsmentioning

confidence: 99%

“…The core-shell model established from optical emission and electron paramagnetic resonance suggests distinguished electronic states in the band gap belonging to negatively charged Zn vacancies and positively charged oxygen vacancies. In [10] the authors report the formation of highly luminescent organic capped colloidal cadmium sulfide (CdS) nanoparticles having the highest photoluminescence quantum yield of 69% in solutions and 34% in neat thin films in the near-infrared range.…”

Section: Introductionmentioning

confidence: 99%

Exciton Spectroscopy of Spatially Separated Electrons and Holes in the Dielectric Quantum Dots

et al. 2018

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It is shown that in the potential energy of an exciton of spatially separated electrons and holes (hole moves in the amount of quantum dots (QDs), and the electron is localized on a spherical surface section (QD-dielectric matrix)) taking into account centrifugal energy gives rise band of the quasi-stationary surface exciton states that with the increase of the radius of QD becomes stationary state. The mechanisms of formation of the spectra of interband and intraband absorption (emission) of light in nanosystems containing aluminum oxide QDs, placed in the matrix of vacuum oil, are presented. It is shown that the electron transitions in the area of the surface exciton states cause significant absorption in the visible and near infrared wavelengths, and cause the experimentally observed significant blurring of the absorption edge.

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“…The importance of CdS as a semiconductor material cannot be over emphasized. Over the years, it has proven to be a very important member of the II-VI semiconductor family, playing significant roles in various types of semiconductor devices ranging from thin film transistors [1] to diodes [2], photoresistors [3], piezo transducers [4], luminescence devices [5], non-linear optics [6], solar cells [7] and so on. As a result, it has attracted huge research attention and continues to do so.…”

Section: Introductionmentioning

confidence: 99%