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

Abstract

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).

A Review on Multiple I-III-VI Quantum Dots: Preparation and Enhanced Luminescence Properties

“…Therefore, the surface defect emission is very sensitive to the surrounding environment. The preparation and the interaction mechanism of I-III-VI type QDs with a high PLQY co-doped by transition metal ions have become the main trend for the development of QDs [ 182 ]. (3) When the concentration of QDs is higher or converted from colloid to powder, the aggregation-induced effect leads to an increase in QD size and a fluorescence quenching phenomenon, resulting in a decrease in the luminous efficiency of the assembled WLED devices.…”

Advancements in semiconductor quantum dots: expanding frontiers in optoelectronics, analytical sensing, biomedicine, and catalysis

“…115 To achieve a broad luminescence peak, purpose trap-related emission can be stimulated via surface passivation 116 or modification 117 or nanocrystals can be doped with specific ions such as Cu + and Mn 2+ . 118 Another emerging technique utilizes the integration of CQDs on different color LED chips. Green- and red-emitting ZnCdSe/ZnSe CQDs were integrated into blue LEDs via liquid injection, resulting in red-green-blue (RGB)- and green-blue (GB)-based white LEDs (Fig.…”

Heterojunction-Forming In–NiS/In2O3 Nanoparticles for the Photocatalytic Degradation of Tetracycline under Full Solar Spectrum Response

“…Sunlight is sustainable and renewable energy with environmentally friendly, energy-saving, and nonpolluting advantages, which has been used in various fields including environmental purification, energy conversion, and water interface evaporation. − Semiconductor photocatalysis is considered a more effective and environmentally friendly approach to break down antibiotics into harmless byproducts using sunlight. , Designing and developing photocatalysts are pivotal to achieving high solar energy conversion. High-efficiency photocatalysts should satisfy the following requirements: (i) good absorption with full-spectrum response; − (ii) rapid charge transfer with high conductivity; − (iii) enough active sites with high specific surface area and low adsorption/activation energy. − …”