Rajendran, VeeramaniVeeramaniRajendranChen, Kuan ChunKuan ChunChenHuang, Wen TseWen TseHuangKamiński, MikołajMikołajKamińskiGrzegorczyk, MaciejMaciejGrzegorczykMahlik, SebastianSebastianMahlikLeniec, GrzegorzGrzegorzLeniecLu, Kuang MaoKuang MaoLuWei, Da HuaDa HuaWeiChang, HoHoChangRU-SHI LIU2023-05-222023-05-222023-04-262380-8195https://scholars.lib.ntu.edu.tw/handle/123456789/631226Phosphor-converted shortwave infrared phosphor light-emitting diodes (pc-SWIR LEDs, 900-1700 nm) are promising next-generation portable light sources for spectroscopy, security, optical communication, and medical applications. A typical design strategy involves energy transfer from Cr3+ to Ni2+, and thus, energy transfer from Cr3+-Cr3+ pairs to Ni2+ ions is important but challenging. Here, we report a Sr1-xLaxAl5.92Cr0.08Ga6-xO19:xNi2+ (x = 0-0.09) series for the SWIR emissions range of 900-1600 nm due to an energy transfer from Cr3+ and Cr3+-Cr3+ pair to Ni2+. Short-range structural studies using electron paramagnetic resonance and magnetometry measurements reveal that Ni2+ ions likely exist as isolated Ni2+ ions and Cr3+-Ni2+ pairs rather than forming Ni2+-Ni2+ pairs. The fabricated prototype SWIR pc-LED delivers a radiant flux of 12.43 mW under a 350 mA driving current. This work provides insights into the codopant strategy for energy transfer and the design of promising next-generation SWIR phosphors.enjournal article10.1021/acsenergylett.3c006802-s2.0-85156269746https://api.elsevier.com/content/abstract/scopus_id/85156269746