Optimization and performance of nitrogen-doped carbon dots as a color conversion layer for white-LED applications

Abstract

In this study, green-emitting nitrogen-doped carbon dots (N-CDots) were synthesized and incorporated into drop-cast composite films for use as color conversion layers in a white-LED configuration to generate white light. In order to resolve the red deficiency of this configuration, a commercial red phosphor was integrated into the system. Moreover, the N-CDots were also processed into polymer/N-CDot composite fibers, for which we determined the amount of N-CDots that yielded adequate white-light properties. Finally, we showed that white light with excellent properties could be generated by employing both of the fabricated N-CDot composites either as drop-cast films or composite fibers. Hence, N-CDots provide a promising alternative to inorganic phosphors that are commonly employed in white-LED configurations.

Polarization‐Sensitive Halide Perovskites for Polarized Luminescence and Detection: Recent Advances and Perspectives

“…HPs with linearly polarized luminescence have been of great interest in the application of polarized light source in recent years. [ 4,23,26,28,30–37,55,56 ] As an alternative for traditional linearly polarized materials in display technology, polarization‐sensitive HPs show great promising owing to its high color‐gamut and low power consumption. The linearly polarized luminescence of HPs can be obtained by controlling the anisotropy of crystal structure, anisotropy of crystal geometry, and anisotropic morphology orientation.…”

“…Güner et al. [ 34 ] demonstrated the composition of CsPbBr 3 NWs embedded in electrospun polyurethane (PU) fibers, which realized the linearly polarized PL emission of the composite. The synthesized CsPbBr 3 NWs, with width of 4 nm and length of hundreds of nanometers, were first integrated into the precursor solution of PU, and then the arrangement of fibers was achieved by simply changing the geometry of the electrospinning against the electrodes.…”

“…Until 2016, the linear polarization luminescence properties of HPs were systematically investigated, [ 23,24 ] and linearly polarized light detection based on HPs NWs was realized for the first time in this year. [ 25 ] Subsequently, linearly polarized luminescence based on HPs NCs, [ 26 ] NWs, [ 27,28 ] NPLs, [ 29,30 ] NRs, [ 31 ] composites, [ 32–38 ] and highly oriented film [ 39 ] were sequentially reported. Meanwhile, linearly polarized light detection was also being implemented in HPs‐based single crystals, [ 40 ] NWs, [ 4,41,42 ] and NPLs.…”

Advances in Electrospun Fiber‐Based Flexible Nanogenerators for Wearable Applications

“…[46] The ability to produce 2D nanofibrous and 3D macrostructures with exceptionally long in length and uniform in diameter makes electrospinning one of the facile and very simple fiber fabrication technique. [47][48][49] Compared to the conventional fiber fabrication techniques, electrospinning permits the fabrication of nanofibers with enhanced surface area, controllable porosity, extremely long length, alignment on the molecular level, and lightweight nature which are needed for various fields [50] such as tissue engineering, [51,52] filtration, [53][54][55] functional materials in industrial applications, [56][57][58][59] sensors, [60][61][62] and energy harvesting applications. [63,64] The adventure of electrospinning dates back to 1934 with the revealing of the electrostatic spinning patent, which describes the production of polymer filaments using electrostatic repulsions of surface charges.…”

You Don’t Learn That in School: An Updated Practical Guide to Carbon Quantum Dots

“…The LEDs were very stable and displayed high color-purity (FWHM of 30–39 nm), a L max of 1882–4762 cd m −2 , and η c of 1.22–5.11 cd A −1 . Guner et al [ 167 ] synthesized N-CQDs for white-LED applications. The CQDs were prepared from diammonium hydrogen citrate and urea by reflux method.…”