Yanzi Sun

Lingnan Normal University

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Qinghua Li

Lingnan Normal University

Fengrui Yan

Lingnan Normal University

Qing Ma

North Sichuan Medical University

Qingping Li

Ocean University of China

Tingting Zhang

Nanjing University of Aeronautics and Astronautics

Jiandi Yuan

Bin Yang

Central South University

Lanting Huang

Chinese Academy of Sciences

Y. C. Cheng

China Jiliang University

Tingting Zhang

Lingnan Normal University

Cooperative Institutions

Lingnan Normal University

Zhejiang University

Harbin Institute of Technology

Chinese Academy of Sciences

Central South University

Henan University

Nanjing University of Aeronautics and Astronautics

Qingdao University

Ocean University of China

State Key Laboratory of Hydrology-Water Resources and Hydraulic Engineering

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High Color Rendering Index WLEDs Enabled by Multi-Band Tuning of InP Quantum Dots

Optical Materials Express (2024)

Qing Ma Bin Yang Yanzi Sun Fengrui Yan Tingting Zhang

Quantum dots (QDs) represent a significant class of fluorescent materials, offering the potential to reduce power consumption and enhance the color rendering index (CRI) of white light-emitting diode (WLED) devices. However, the presence of toxic elements such as Cd and Pb in traditional fluorescent QDs limits their widespread commercial application. Compared to the broad emission characteristics of environmentally friendly AgInS 2 and CuInS 2 QDs, the narrower linewidth of InP-based core-shell QDs is advantageous for developing WLED devices with a higher CRI. In this study, we employed a multistage heating method to synthesize a series of amino-phosphine-based InP/ZnSe core-shell QDs, which exhibited emission wavelengths ranging from 535 to 650 nm, narrow emission linewidths of 43-47 nm, and high photoluminescence quantum yields of 60%-80%. Subsequently, six different color QDs are used to fabricate a WLED device. The best WLEDs show not only bright warm light (correlated color temperature = 3323 K) with a maximum luminous efficacy of 74.1 lm W -1 , but also excellent color quality (CRI Ra = 93, as well as R9 = 94.8, and R13 = 97.1). These results indicate remarkable progress in InP-based WLEDs for high-quality lighting applications.

Color rendering index

Indium phosphide

10.1364/ome.540696

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Photoluminescent Cd_xZn_1–xS/CdSe/Cd_yZn_1–yS Core/Shell Quantum Dots of Varying Shell Thicknesses for White Light-Emitting Diodes

ACS Applied Nano Materials (2025)

Jinke Bai Yuyang Han Linfeng Wang Yanzi Sun Fengrui Yan

Designing a type-I core–shell structure with a shell thickness of >5 nm is the best approach for achieving highly luminescent and stable colloidal quantum dots (QDs). Investigating the temperature-dependent photoluminescence (PL) spectra of these QDs with varying shell thicknesses will help us gain a deeper understanding of how shell thickness influences their diverse optical properties. In this study, we systematically synthesized highly luminescent red- and green-emitting CdxZn1–xS/CdSe/CdyZn1–yS QDs with coherent strained well-type structures featuring varying shell thicknesses. Then, three shell thicknesses of red- and green-emitting QDs with comparable luminescence properties are selected to investigate their photoluminescence properties under temperatures from 80 to 431 K. We find that as the temperature increases, the spectral redshift, broadening, and intensity reduction of the QDs caused by phonon participation are inverse to the shell thickness. Fitting results reveal that a thicker shell weakens electron(exciton)-phonon coupling and increases the exciton binding energy of QDs by isolating the photogenerated excitons away from the inorganic–organic interface. This enables the QDs with a thicker shell to exhibit excellent luminescence efficiency and thermal stability, as evidenced by the stability performance (under varied currents and long-term operation) of photoluminescence white light-emitting diodes based on red- and green-emitting QDs with three different shell thicknesses. Our findings offer an alternative interpretation of the shell thickness-dependent photoluminescence properties of QDs.

10.1021/acsanm.4c05968

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Simple Synthesis of AgInS2/ZnS Core/Shell Quantum Dots with Wide Tunable Emission Wavelength for White Light-Emitting Diodes

Optics Communications (2024)

Qing Ma Bin Yang Fengrui Yan Yanzi Sun Jiandi Yuan

10.1016/j.optcom.2024.131285

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Simple Synthesis of Agins2/Zns Core/Shell Quantum Dots with Wide Tunable Emission Wavelength for White Light-Emitting Diodes

Qinghua Li Qing Ma Bin Yang Fengrui Yan Yanzi Sun

10.2139/ssrn.4965319

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