Bright Electroluminescent White‐Light‐Emitting Diodes Based on Carbon Dots with Tunable Correlated Color Temperature Enabled by Aggregation

Abstract

Carbon dots (CDs) as one of the most promising carbon‐based nanomaterials are inspiring extensive research in optoelectronic applications. White‐light‐emitting diodes (WLEDs) with tunable correlated color temperatures (CCTs) are crucial for applications in white lighting. However, the development of high‐performance CDs‐based electroluminescent WLEDs, especially those with adjustable CCTs, remains a challenge. Herein, white CDs‐LEDs with CCTs from 2863 to 11 240 K are successfully demonstrated by utilizing aggregation‐induced emission red‐shifting and broadening of CDs. As a result, a series of warm white, pure white, and cold white CDs‐LEDs are realized with adjustable emissions in sequence along the blackbody radiation curve. These CDs‐LEDs reach maximum brightness and external quantum efficiency up to 1414–4917 cd m−2 and 0.08–0.87%, respectively, which is among the best performances of white CDs‐LEDs. To the best of the authors′ knowledge, this is the first time that CCT‐tunable white electroluminescent CDs‐LEDs are demonstrated through controlling the aggregation degrees of CDs.

Single-component electroluminescent white light-emitting diodes based on zinc oxide quantum dots with high color rendition and tunable correlated color temperature

“…It was also observed that V on (defined as the voltage at 1 cd m −2 ) of both the pure poly-TPD and poly-TPD:TFB single-component ZnO-WLEDs is around 2 V, which is much smaller than those of other types of WLEDs. 16,17,19,35–37 Thus, the EL performance of the present devices is best among that of the single-component ZnO-WLEDs reported so far. Moreover, the optimized L max in the single-component ZnO-WLEDs based on poly-TPD:TFB is nearly twice that in the neat poly-TPD-based devices.…”

Machine learning guided full-color V4C3 MXene quantum dots for building WLEDs

“…The optimal CIE coordinates (0.333, 0.397) were obtained by developing the WLED guided by XGB of the ML model. CIE coordinates (0.333, 0.397) are located in the center of the nearby, showing an excellent white light, which corresponds to a good color temperature (CCT) of 5478.32 K. 34,35…”

The coupling of blue emitting carbon dots with Eu3+/Tb3+ co-doped luminescent glasses for utilization in white light emitting diodes

“…Unlike conventional quantum dots, such as CdTe, CdSe, PbSe, and GaAs, CDs do not contain environmentally harmful heavy metal ions, e.g., Cd, Pb, and As. [34][35][36][37][38] In our previous work, we demonstrated that combining blue-emitting carbon dots (BCDs) with Dy 3+ doped glasses could be an efficient way to generate white light emission and compensate for the low blue light emission of Dy 3+ ions. However, the PLQY values and colorimetric properties, e.g.…”

“…, Cd, Pb, and As. 34–38 In our previous work, we demonstrated that combining blue-emitting carbon dots (BCDs) with Dy 3+ doped glasses could be an efficient way to generate white light emission and compensate for the low blue light emission of Dy 3+ ions. However, the PLQY values and colorimetric properties, e.g.…”