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CHEMICAL RESEARCH IN CHINESE UNIVERSITIES · 2023 ·Vol. 39 ·期 4 ·654-659 · IF 3.1

Tuning Photodetection Band of MAPbX3(X=Cl/Br/I) Perovskite Single Crystals by Sub-nano Carbon Dot Doping

Zhu Xia,An Jiakun,Chen Gaoyu,Xing Chenyu,Bao Jianchun,Xu Xiangxing

Perovskite single crystals are prominent semiconductor materials due to their high carrier mobility, long carrier diffusion length, and large absorption coefficient. They can be used as optoelectronic functional materials for narrowband or broadband photodetectors. In this report, the photodetection band tunability was achieved by doping MAPbX 3 (MA=methylammonium, X=Cl/Br/I) perovskite single crystals with sub-nano carbon dots (MAPbX 3 -C). The sub-nano size and good dispersibility of the carbon dots ensured controllable doping. The absorption of the sub-nano carbon dots and trap states in the MAPbX 3 -C single crystals resulted in the special responsivity spectrum features.

研究领域: 材料科学 · 光电子学 · 半导体物理 · 纳米技术 · 光子学

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Small · 2025 ·Vol. 21 ·期 36 ·e06207 · IF 12.1

10-ppb Trace Doping in Boron Oxide Resolves Purity Paradox for Programmable Time-Dependent Phosphorescent Color

Liping Guan,Ruixing Wang,Jing Liu,Xiaoqing Cao,Yi Xu,Xianggui Kong,Wenying Shi

The development of eco-friendly time-dependent phosphorescent color (TDPC) materials faces a critical paradox: Boron oxide (B 2 O 3 ) derived from commercial boric acid (B 2 O 3 - CBA ) exhibits stable room-temperature phosphorescence (RTP) regardless of purity, while ultrapure synthetic analogs remain non-emissive. Here, this dilemma is resolved by engineering carbon dots (CDs) doped into B 2 O 3 - CBA at ultralow concentrations (10 ppb), achieving programmable TDPC through three breakthroughs. Synergistic host-guest confinement amplifies green RTP efficiency by an order of magnitude enhancement while activating yellow guest emission; Defect-mediated exciton transfer extends RTP lifetimes to 304 ms, doubling B 2 O 3 - CBA ; Time-resolved chromatic evolution (Δλ = 65 nm) emerges exclusively in doped systems, enabled by bifurcated decay kinetics from dual confinement mechanisms. The CDs@B 2 O 3 exhibits remarkable stability in harsh liquids, overcoming stability barriers for encryption applications. This ppb-level doping strategy circumvents purity debates while preserving host crystallinity—a critical advance toward scalable anti-counterfeiting tags and bioimaging probes with programmable temporal-color responses.

CAS / MDL: 10043-35-3

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Tuning Photodetection Band of MAPbX3(X=Cl/Br/I) Perovskite Single Crystals by Sub-nano Carbon Dot Doping

10-ppb Trace Doping in Boron Oxide Resolves Purity Paradox for Programmable Time-Dependent Phosphorescent Color