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ACS Applied Nano Materials · 2023 · IF 5.9

Single-Phase Cu,Mn-Codoped ZnGaS/ZnS Quantum Dots for Full-Spectrum White-Light-Emitting Diodes

Hanxu Lu,Zhe Hu,Hong Liu,Zizhao Fu,Hanqing Dai,Wanlu Zhang,Ruiqian Guo

Transition-metal-ion-doped quantum dots (QDs) are promising candidates to fabricate full-spectrum white-light-emitting diodes (WLEDs). In this work, a series of efficient white-light-emitting Cu,Mn-codoped ZnGaS/ZnS (Cu,Mn:ZnGaS/ZnS) QDs were synthesized by controlling the Zn/Ga molar ratio and the amounts of Mn dopants. After ZnS shelling, the photoluminescence quantum yield reached 58% and the spectrum almost covered the whole visible spectrum. Further, the stepwise doping process was investigated, which had considerable reference value to subsequent research. The Cu,Mn:ZnGaS/ZnS QDs were employed to fabricate WLEDs displaying a color rendering index of 94 and CIE coordinates of (0.34, 0.35).

CAS / MDL: 10139-47-6 112-90-3 112-88-9

研究领域: 材料科学 · 光学工程

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INORGANIC CHEMISTRY · 2024 · IF 4.3

Achieving Bright Luminescence and X-ray Scintillation in Zero-Dimensional Cesium Zinc Bromides by Cu+–Mn2+ Codoping

Jie Hou,Jun Chen,Cheng Luo,Juntao Li,Cheng Li,Ruiling Zhang,Jianyong Liu,Peigeng Han

Zero-dimensional (0D) metal halides have emerged as excellent luminescent materials for optical and optoelectronic applications. Especially environmentally friendly ternary zinc halides have recently drawn increasing attention. Herein, we present the codoping of Cu+ and Mn2+ ions into 0D Cs2ZnBr4 single crystals (SCs), which show bright PL emission and high stability. Adjusting the Cu+/Mn2+ ratio can make the photoluminescence quantum yield (PLQY) exceed 90%, which is much higher than that of the single-ion doped sample. The efficient PL is determined by a combination of Cu+–Mn2+ competitive interaction, Cu+–Mn2+ energy transfer, and Cu+–Mn2+ synergistic passivation. More interestingly, the codoped sample shows a better scintillation performance with a low detection limit of 52 nGyair/s and a sensitive spatial resolution of 13.2 lp/mm. We further explore the promising applications of Cu+–Mn2+-codoped Cs2ZnBr4 SCs for anticounterfeiting and X-ray imaging. These results not only help to grasp the excited-state photophysical processes of 0D codoped metal halides but also provide a new way for the design and development of environmentally friendly luminescent materials.

CAS / MDL: 7787-69-1 7699-45-8

研究领域: 材料科学 · 光学

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Single-Phase Cu,Mn-Codoped ZnGaS/ZnS Quantum Dots for Full-Spectrum White-Light-Emitting Diodes

Achieving Bright Luminescence and X-ray Scintillation in Zero-Dimensional Cesium Zinc Bromides by Cu+–Mn2+ Codoping