Patterned mist deposition of tri-colour CdSe/ZnS quantum dot films toward RGB LED devices

Abstract

In this experiment a technique of mist deposition was explored as a way to form patterned ultra-thin-films of CdSe/ZnS core/shell nanocrystalline quantum dots using colloidal solutions. The objective of this study was to investigate the feasibility of mist deposition as a patterning method for creating multicolour quantum dot light emitting diodes. Mist deposition was used to create three rows of quantum dot light emitting diodes on a single device with each row having a separate colour. The colours chosen were red, green and yellow with corresponding peak wavelengths of 620 nm, 558 nm, and 587 nm. The results obtained from this experiment show that it is possible to create multicolour devices on a single substrate. The peak brightnesses obtained in this experiment for the red, green, and yellow were 508 cd/m, 507 cd/m, and 665 cd/m, respectively. The similar LED brightness is important in display technologies using colloidal quantum dots in a precursor solution to ensure one colour does not dominate the emitted spectrum. Results obtained in-terms of brightness were superior to those achieved with inkjet deposition. This study has shown that mist deposition is a viable method for patterned deposition applied to quantum dot light emitting diode display technologies.

Full‐visible spectrum emitting Zn–In–S:Cu/ZnS nanocrystals based on varying Cu concentrations and its application in white LEDs

“…They have become the focus of social attention for different optoelectronic applications because of many unique optical properties, such as a larger Stokes shift, the improved thermal and photochemical stability, a longer fluorescence lifetime, etc . In addition, quantum dot‐based light‐emitting diodes (QD‐LEDs) is one of the most promising applications for d‐NCs . However, the chosen NC materials are mainly focused on the CdS/Se‐based host material.…”

“…2,3,[5][6][7][8][9][10][11][12] In addition, quantum dot-based light-emitting diodes (QD-LEDs) is one of the most promising applications for d-NCs. 7,13,14 However, the chosen NC materials are mainly focused on the CdS/Se-based host material. Unquestionably, the high cytotoxicity of cadmium element shields the practical applicability of these d-NCs.…”

Direct Interband Light Absorption in Conical Quantum Dot

“…Such a case is possible when, during the experiment, conical quantum dots were grown with high height [1][2][3]. Condition (1) gives us the opportunity to apply geometrical adiabatic approximation for solving the problem [13].…”

“…The conical quantum dots (CQD) are zero-dimensional systems with nontrivial geometry, the analytic description of which is an extremely difficult problem [1][2][3][4][5]. From the other side, availability of many geometrical parameters characterizing the CQD allows realizing flexible manipulation of the energy levels of the charge carriers in these systems.…”

Tracing multi-isotopically labelled CdSe/ZnS quantum dots in biological media

“…At a specific wavelength, bigger QDs emit longer wavelengths thereby resulting in red or orange emission colors, while smaller QDs emit shorter wavelengths (blue or green). They have been the focus of substantial attention over the past decade and are widely used in various applications: nowadays, QDs are mostly used in Light-Emitting Diodes (LEDs)/Organic LEDs (OLED) as light conversion materials (90%) and in laboratories for imaging (10%) 4,5 . Since the early 2000s, CdSe/ZnS QDs have been used in laboratories for disease sensing and the delivery of antibacterial/anticancer drugs [6][7][8] .…”