Hydrogen Peroxide‐Treated Carbon Dot Phosphor with a Bathochromic‐Shifted, Aggregation‐Enhanced Emission for Light‐Emitting Devices and Visible Light Communication

Abstract

It is demonstrated that treatment of blue‐emissive carbon dots (CDs) with aqueous hydrogen peroxide (H2O2) results in the green emissive solid state CD phosphor with photoluminescence quantum yield of 25% and short luminescence lifetime of 6 ns. The bathochromic‐shifted, enhanced green emission of H2O2‐treated CDs in the powder is ascribed to surface state changes occurring in the aggregated material. Using the green emissive H2O2‐treated CD phosphor, down‐conversion white‐light‐emitting devices with cool, pure, and warm white light are fabricated. Moreover, using the green emissive CD phosphor as a color converter, a laser‐based white‐light source is realized, and visible light communication with a high modulation bandwidth of up to 285 MHz and data transmission rate of ≈435 Mbps is demonstrated.

Carbon quantum dots enhanced the activity for the hydrogen evolution reaction in ruthenium-based electrocatalysts

“…Carbon quantum dots (CQDs) are emerging nanomaterials that show great promise for bioimaging, 35 optical sensing, 36 catalysis 37 and photovoltaic applications. [38][39][40][41] CQDs with high stability, easy surface functionalisation, and high electrical conductivity are attractive materials for the design and fabrication of photo-electro-catalyst. [42][43][44] The variety of functional groups (-COOH, -NH 2 , -OH, -CQO etc.)…”

Self‐Quenching‐Resistant Red Emissive Carbon Dots with High Stability for Warm White Light‐Emitting Diodes with a High Color Rendering Index

“…Innumerable explorations in WLEDs filed are emerging repeatedly because of remarkable optical characteristic of CDs, such as strong UV absorption, tunable fluorescence emission, high thermal stability, and photostability. [ 27 ] Acquiring fluorescence emission across the entire visible spectrum has been admitted as a key of WLEDs. [ 28 ] However, efficient long‐wavelength (orange and red light regions) emissive CDs are very scarce due to lack of effective synthesized method and blur luminescence mechanism.…”

Application advances of carbon quantum dots in optoelectronic devices

“…粉、半导体QDs, CQDs等 [11,12] . Figure 3 (Color online) Solid-state quenching mechanism of CQDs and fluorescence recovery mechanism of CQD/SiO 2 composite [37] 2017年, Wang等人 [52] 以二羟基萘为原料, 通过溶 [52] 2019 年 5 月 第 64 卷 第 14 期…”

“…目前, CQDs的发光波 长已经可以由深紫外区扩展到近红外区 [9] , 且蓝、绿、 红 光 C Q D s 的 Q Y 最 高 分 别 已 经 高 达 9 9 % ， 8 1 % 和 80% [10,11] . 由于其具有较高的电子迁移率、较长的热电 子寿命、宽的光学吸收, 使其在白光发光二极管(white light-emitting diode, WLED) [12~14] 、QDs电致发光二极 管(QD-based electroluminescent light-emitting diode, QLED) [15~17] 、激光二极管(laser diode, LD) [18,19] 、可见 光通信(visible light communication, VLC) [12,13] 、聚合物 太阳能电池(polymer solar cell, PSC)…”