Ultrahigh Quantum Efficiency Near-Infrared-II Emission Achieved by Cr3+ Clusters to Ni2+ Energy Transfer
journal contribution
posted on 2024-11-17, 13:50authored byChih Yu Chang, Ming Hsuan Huang, Kuan Chun Chen, Wen Tse Huang, Mikołaj Kamiński, Natalia Majewska, Tomasz Klimczuk, Jia Hao Chen, Ding Hua Cherng, Kuang Mao Lu, Wei Kong Pang, Vanessa K Peterson, Sebastian Mahlik, Grzegorz Leniec, Ru Shi Liu
Increasing demand for near-infrared-II (NIR-II) light sources requires improved NIR-II phosphors. We present a series of phosphors codoped with Cr3+ and Ni2+ that possess NIR-II emission with an unprecedented internal quantum efficiency (IQE) of 97.4%. Our study reveals an energy transfer mechanism involving clusters of Cr3+ where luminescent centers are closely matched in energy and where the Ni2+ emission intensity can be tuned through sintering temperature. The profound electron paramagnetic resonance (EPR) studies disclose the interaction between Cr3+ clusters and Cr3+-Ni2+ pairs, further proving the cause of such a high IQE and the significance of Cr3+ clusters. This work provides promising pathways for the development of NIR-II light-emitting diodes with outstanding efficiency by suggesting a new energy transfer source of Cr3+
Funding
Ministry of Science and Technology, Taiwan (NSTC 112-2113-M-002-020)