Han Kai, Wang Xuesong, Jin Jiance, Zhang Shuai, Li Liang, Wang Yuzhen, Ning Lixin, Xia Zhiguo
State Key Laboratory of Luminescent Materials and Devices, Guangdong Provincial Key Laboratory of Fiber Laser Materials and Applied Techniques, Guangdong Engineering Technology Research and Development Center of Special Optical Fiber Materials and Devices, School of Physics and Optoelectronics, South China University of Technology, Guangzhou, 510641, China.
Anhui Province Key Laboratory for Control and Applications of Optoelectronic Information Materials, Key Laboratory of Functional Molecular Solids, Ministry of Education, Anhui Normal University, Wuhu, 241000, China.
Nat Commun. 2025 Jul 1;16(1):5641. doi: 10.1038/s41467-025-60852-9.
Narrow-band emitters are essential for solid-state lighting, displays, and single-photon sources. Here we design a family of lead-free Eu(II)-based hybrid perovskitoids with tightly face-shared connected [EuBr] octahedrons, and the experimental and theoretical analyses verify that the electron-phonon coupling therein is suppressed via symmetrical structural parameters as confirmed by the low Huang-Rhys factor, and thus diminishes the homogeneous broadening of the emission bandwidths. Thus, TEtEuBr (TEt is Tetraethylammoniumwith) with symmetrical octahedrons shows ultra-narrow-band cyan emission (full width at half maximum ~36 nm) characterized by localized 5d-4f transition of Eu(II). The as-fabricated phosphor-converted light-emitting-diodes demonstrate low blue light hazard index and high color-rendering index of 96% in full-spectrum lighting technologies, moreover, they realize ultrahigh color gamut of ~115% Rec. 2020 as four-color display devices. We expect this strategy can be expanded to other narrow-band emitters for state-of-the-art optoelectronic applications.
窄带发射体对于固态照明、显示器和单光子源至关重要。在此，我们设计了一族基于无铅 Eu(II) 的杂化钙钛矿类似物，其具有紧密面共享连接的 [EuBr] 八面体，实验和理论分析证实，通过对称结构参数抑制了其中的电子 - 声子耦合，低 Huang-Rhys 因子也证实了这一点，从而减小了发射带宽的均匀展宽。因此，具有对称八面体的 TEtEuBr（TEt 是四乙铵）表现出超窄带青色发射（半高宽约 36 nm），其特征在于 Eu(II) 的局域 5d - 4f 跃迁。所制备的磷光体转换发光二极管在全光谱照明技术中显示出低蓝光危害指数和 96% 的高显色指数，此外，作为四色显示器件，它们实现了约 115% Rec. 2020 的超高色域。我们期望这种策略能够扩展到其他窄带发射体，用于先进的光电子应用。
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