Achieving 46% efficient white-light emissive carbon dot-based materials by enhancing phosphorescence for single-component white-light-emitting diodes

Abstract

White-light-emitting carbon dots (CDs) with fluorescence/phosphorescence dual-emission feature is great importance for single-phase white-light-emitting diodes (WLEDs), but so far rather limited due to weak phosphorescence. Herein, a highly efficient white-light...

Theoretical Understanding of Structure–Property Relationships in Luminescence of Carbon Dots

“…Structure and Phosphorescence . At present, transition metal-based complexes, rare earth-based phosphors, and pure organic compounds are mainly the traditional phosphorescent materials. − However, these phosphorescent materials have the following shortcomings: high cost and complex preparation and purification processes; strict conditions are required to effectively produce phosphorescence. , Some exciting progress has been made in the field of long lifetime RTP CDs, which enables CDs suitable for various important applications. − However, there are still relatively few studies on the phosphorescence mechanism of CDs. In this section, we summarize the progress of CDs in the field of phosphorescence in recent years and the unique role of theoretical calculations in revealing the mechanism of phosphorescence.…”

Machine learning guided microwave-assisted quantum dot synthesis and an indication of residual H2O2 in human teeth

“…4(a)) shows a typical absorption peak at 237 nm corresponding to the π–π* transition. 52 We also studied the optical properties of the CDs. Fig.…”

Ultra‐strong phosphorescence with 48% quantum yield from grinding treated thermal annealed carbon dots and boric acid composite

“…The Fourier transform infrared (FTIR) spectra (Figure 2B) reveal that the CDs exhibit characteristic absorption peaks at 3400, 1631, and 1617 cm −1 , assigned to the O─H, C═O, and C═C stretching vibrations, respectively 27 . After incorporating the CDs into the thermal annealed BA matrix, new absorption peaks can be observed at 941 cm −1 , corresponding to the C─B stretching vibration, 18,21,22 indicating BA molecules functionalized on the CDs after thermal treatment. In the XPS results, the high‐resolution B 1 s spectrum of t‐CD@BA (Figure 2C) displays three bands centered at 194.6, 193.6, and 192.7 eV, assigned to B─O, B 2 O 3 , and BCO 2 , respectively, 18 implying dehydration process occurs among CDs and BA molecules.…”

“…Carbon dots (CDs) are emerging as a new class of phosphorescence nanomaterials, 11–17 which have attracted significant attention because of their attractive properties, such as simple synthetic routes, low cost, and high photostability. Recently, a principle on manipulating intersystem crossing (ISC) by incorporating heteroatoms into CDs (e.g., N, P, B, and halogens) was proposed to achieve effective RTP 18–23 . Liu et al obtained N,P‐doped CDs with a PQY of 17.5%, 18 while Wang et al reported B,P‐doped CDs that exhibited a high PQY of 23% 20 .…”

“…Recently, a principle on manipulating intersystem crossing (ISC) by incorporating heteroatoms into CDs (e.g., N, P, B, and halogens) was proposed to achieve effective RTP. [18][19][20][21][22][23] Liu et al obtained N, P-doped CDs with a PQY of 17.5%, 18 while Wang et al reported B,P-doped CDs that exhibited a high PQY of 23%. 20 Additionally, restriction of the CDs, achieved by embedding CDs into solid matrices, have been used extensively to construct effective RTP CD materials.…”