Woo Ho Young, Yu Mi Yeon, Kim Seung Hyeon, Lee Da Won, Choi Yoonjoo, Kim Yerin, Park Giyong, Choi Hyungyoon, Paik Taejong
School of Integrative Engineering, Chung-Ang University, Seoul, 06974, Republic of Korea.
Department of Intelligent Semiconductor Engineering, Chung-Ang University, Seoul, 06974, Republic of Korea.
Nano Converg. 2025 Jun 29;12(1):31. doi: 10.1186/s40580-025-00496-z.
Lanthanide-based inorganic nanomaterials have been widely utilized as luminescent materials for broad-ranging applications in lighting, display, and optoelectronic devices. Among lanthanide elements, divalent europium (Eu) has recently gained significant attention owing to its excellent photoluminescence (PL) properties, such as a short radiative decay lifetime, narrow PL bandwidth, and wide emission range from ultraviolet to near-infrared. Particularly, colloidal metal halide nanocrystals (MHNCs) offer unique advantages as inorganic hosts for Eu owing to their excellent phase purity, chemical and optical stability, and colloidal stability for facile integration via solution processes. In addition, the PL properties of Eu, originating from the parity-allowed 4f-5d transitions, can be precisely controlled by tuning the phase and compositions of MHNCs. Therefore, an in-depth understanding of the Eu PL mechanism and synthesis of phase-pure MHNCs is essential for the advancement of Eu-based MHNCs as novel emitters. This review summarizes recent developments in Eu-based colloidal MHNCs and their PL properties. First, the local factors affecting the luminescence properties of Eu in inorganic hosts are discussed. Subsequently, recent advances in the synthesis of Eu-based MHNCs using different host-dopant frameworks, their optical proprieties, and applications are outlined. This comprehensive review provides valuable insights for designing high-performance emitters, particularly for achieving deep-blue emission in light-emitting diodes and high-energy scintillators.
基于镧系元素的无机纳米材料已被广泛用作发光材料，在照明、显示和光电器件等广泛领域有着应用。在镧系元素中，二价铕（Eu）因其优异的光致发光（PL）特性，如短辐射衰减寿命、窄PL带宽以及从紫外到近红外的宽发射范围，最近受到了极大关注。特别是，胶体金属卤化物纳米晶体（MHNCs）作为Eu的无机主体具有独特优势，因为它们具有优异的相纯度、化学和光学稳定性以及胶体稳定性，便于通过溶液法进行集成。此外，源于宇称允许的4f-5d跃迁的Eu的PL特性可以通过调节MHNCs的相和组成来精确控制。因此，深入了解Eu的PL机制以及合成相纯的MHNCs对于将基于Eu的MHNCs发展成为新型发光体至关重要。本综述总结了基于Eu的胶体MHNCs及其PL特性的最新进展。首先，讨论了影响Eu在无机主体中发光特性的局部因素。随后，概述了使用不同主体-掺杂剂框架合成基于Eu的MHNCs的最新进展、它们的光学性质和应用。这篇全面的综述为设计高性能发光体提供了有价值的见解，特别是对于在发光二极管和高能闪烁体中实现深蓝色发射而言。
