Recent advances in white light-emitting diodes of carbon quantum dots

Abstract

In this mini review, we update the latest research in the design of high-performance WLEDs with different correlated color temperatures by tuning the red component using red emissive CQDs and single-component white emissive CQDs.

Carbon‐Based Quantum Dots with Solid‐State Photoluminescent: Mechanism, Implementation, and Application

“…[3d] Some researchers believe that CDs have electronic bandgap structures that are mainly influenced by quantum confinement effects. [28] On the other hand, other researchers believe that their bandgap structures are dictated by surface energy traps (which is significantly different from GQDs). [29] Graphene sheets of nanoscale dimension are also known to exhibit quantum confinement effects wherein the bandgap increases as the size of the graphene fragment decreases.…”

Rare Earth‐Free Luminescent Materials for WLEDs: Recent Progress and Perspectives

“…The preparation methods, structural characteristics, and luminescence mechanism of fluorescent carbon dot materials with white light emission have been systematically reviewed previously. [41,42] In recent years, a large number of new carbon dot materials have been developed and applied to WLED. In this section, the recent research progress in this field has been reviewed from the perspective of white light materials, with a focus on the most relevant results obtained in this field.…”

A Perspective on Application of Carbon Quantum Dots in Luminescence Immunoassays

“…Photoluminescence is a common and important property of CQDs, which empowers many researchers to make use of CQDs for various purposes such as light-emitting device fabrications (Yuan et al, 2018 ; He et al, 2020 ), and more widely for detecting diverse target species e.g., metal ion detection (Gao et al, 2016 ; Liu et al, 2017 ). The overall photophysical responses of CQDs in the course of light absorption and emission processes are based on an isolated network of π-bonding originating from sp 2 carbon backbones.…”

“…Carbon quantum dots (CQDs) are a newly developed division of carbon-based nanomaterials (e.g., nanodiamond, fullerenes, carbon nanotubes, graphene, and graphene oxide) which are environmentally friendly, chemically stable, and reasonably conductive (Lim et al, 2015 ; Cayuela et al, 2016 ; Liu et al, 2016 ; Namdari et al, 2017 ; Molaei, 2020 ). These basic properties have attracted a wide range of researchers to employ CQDs in various applications including biomedical and biotechnological applications (Namdari et al, 2017 ; Iravani and Varma, 2020 ), dye-synthesized solar cells (Gao et al, 2020 ), light-emitting devices, (Yuan et al, 2018 ; He et al, 2020 ) imaging and bioimaging (Zhu et al, 2012 ; Jiang et al, 2015a ; Smith and Gambhir, 2017 ; Panwar et al, 2019 ; Liu Y. et al, 2020 ), electrochemical and electrochemiluminescence studies (Wang and Dai, 2015 ; Fiorani et al, 2019 ; Wang et al, 2019 ; Chen et al, 2020 ; Kour et al, 2020 ; Zhong et al, 2020 ), and sensing (Li et al, 2019 ; Huang et al, 2020 ; Molaei, 2020 ; Tajik et al, 2020 ). More importantly, CQDs possess outstanding optical features, including a bright and tunable luminescence emission within a wide range of wavelengths (Sun et al, 2006 ; Wang et al, 2017 ).…”