Tailoring Photophysical Processes of Er 3+ ‐Doped Gd 3 Ga 5 O 12 Garnets for Enhanced Photoluminescence via Al 3+ Ion Preference Substitution

作者：Zhengjie Tian, Haiyan Wang, Yunfeng Lou, Qihang Deng, Zhi Yong Yang, Xiyong Chen, Bingsuo Zou, Mingjian Yuan, Ruosheng Zeng · 发表于：Carbon Energy · 年份：2025 · DOI：10.1002/cey2.70005 · 被引用次数：6 · 研究领域：Luminescence Properties of Advanced Materials、Perovskite Materials and Applications、Microwave Dielectric Ceramics Synthesis

ABSTRACT Rare‐earth ion‐doped garnets with excellent luminescent properties show great potential for temperature sensing, displays, and nondestructive detection. However, their limited luminescent modes and low photoluminescence quantum yields (PLQY) restrict further applications. In this study, we synthesized Al 3+ , Er 3+ ‐co‐doped Gd 3 Ga 5 O 12 garnets with multimode luminescence via a high‐temperature solid‐state method. Notably, the preferential substitution of Al 3+ ion at octahedral‐coordinated Ga I sites significantly enhanced the charge density and electron transition probability, achieving a PLQY enhancement of the down‐shifting luminescence from 35.1% to 68.5%. Al 3+ ion also influences electron relaxation during up‐conversion luminescence, resulting in a color shift from red to yellow to green. Additionally, Al 3+ incorporation increased the photoelectric conversion efficiency of light‐emitting diodes from 2.9% to 6.3% and improved temperature sensing sensitivity from 2.7% to 5.1% K⁻¹. This work provides new insights into the photophysical mechanisms and underscores the key role of Al 3+ ion in optimizing the optical properties of garnet‐based materials.