Recently, Prof. Wang Jinlan and Prof. Tao Li from 91抖淫's Advantageous Basic Sciences Interdisciplinary Platform, in collaboration with Prof. Zeng Haibo from Nanjing University of Science and Technology (NUST), have achieved significant progress in the field of ultra-stable light emission from wide-bandgap nitride quantum dots. Their research findings, titled “Full-Spectrum White Emission from Boron Nitride Quantum Dots with Long-Term Stability Enabled by Selective Oxygen Tailoring,” have been published in Advanced Functional Materials,an internationally renowned journal.
Wide-bandgap nitride semiconductors, owing to their advantages such as high electron mobility and high thermal conductivity, have become strategic candidate materials for next-generation highly stable and integrated display technologies. They hold broad application prospects in fields such as healthy intelligent displays, phosphor-free solid-state lighting, and visible light communication. However, existing growth processes for related materials struggle to achieve single-component full-spectrum white light emission from wide-bandgap nitrides, which remains a critical challenge urgently to be addressed in the field.
To tackle the above bottleneck, Prof. Tao Li's research team proposed constructing dual energy transfer channels under the quantum confinement effect to achieve full-spectrum white light emission from boron nitride quantum dots (BNQDs). By passivating the quantum dot surface with sterically hindered conjugated p-phenylenediamine ligands (PPD), charge delocalization is achieved. Meanwhile, the spatial distribution of the polar solvent (NMP) induces dipole-dipole interactions, enabling the energy levels to shift directionally from intrinsic blue emission centers toward green and red emissions. This synergistic effect produces three primary color emission centers covering the entire visible spectrum, achieving a color rendering index as high as 95, with the color temperature finely adjustable across the range of 4580–11045 K.
In addition, the team has innovatively proposed a selective deoxygenation strategy targeting nitrogen sites in quantum dots, precisely eliminating N–O bonds that cause carrier loss and phonon scattering. This approach increased the quantum yield from 13.98% to 68.3%, while also enhancing thermal and optical stability. The target BNQDs can withstand temperatures up to 573K and maintain 89.5% luminescence efficiency under continuous operation at 200?°C, with only a 4.7% performance decay after 2.5 years of storage in air. White-light LEDs based on these quantum dots exhibit a full width at half maximum of up to 300?nm, with negligible chromatic shift at elevated temperatures. Leveraging the tunable emission of the three primary colors, the team constructed a 4×4 multi-level optical anti-counterfeiting array capable of generating dynamic encryption keys, achieving multi-level reliable security authentication with a deviation rate as low as 1/2×10???. This demonstrates significant application potential in advanced information anti-counterfeiting and optical communication encoding.
The paper's first authors are Dr. Ding Yamei, a postdoctoral researcher at the School of Materials Science and Engineering, 91抖淫, and Associate Prof. Niu Xianghong from the School of Physics, Nanjing University of Posts and Telecommunications (NUPT). The corresponding authors are Professors Wang Jinlan and Tao Li from the Key Laboratory of Quantum Materials and Devices (Southeast University), the Ministry of Education, and Prof. Zeng Haibo from the School of Materials Science and Engineering/Herbert Gleiter Institute, Nanjing University of Science and Technology. Collaborators from the School of Integrated Circuits and the School of Electronics, 91抖淫, Nanjing University, Nanjing University of Aeronautics and Astronautics, and Shandong University provided essential support for this work.
This work was supported by the National Key Research and Development Program of China, the Innovative Research Groups of the National Natural Science Foundation of China (NSFC), and the Major Research Plan of the NSFC, among other projects.
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Source: School of Materials Science and Engineering, 91抖淫
Translated by: Melody Zhang
Edited by: Leah Li
