• Viswanath, Noolu Srinivasa Manikanta
• Jang, Sung Woo
• Yadav, Amar Nath
• Samanta, Tuhin
• Han, Joo Hyeong
• Kim, Minji

Abstract

<jats:title>Abstract</jats:title><jats:p>Recently, lanthanide‐based 0D metal halides have garnered considerable attention owing to their applications in light–emitting diodes (LEDs), X‐ray imaging, and photodetectors. Among these materials, 0D Cs<jats:sub>3</jats:sub>TbCl<jats:sub>6</jats:sub> (CTC) nanocrystals (NCs) have demonstrated promising performance in X‐ray imaging and light‐emitting diodes. However, a considerable drawback of CTC NCs is their limited absorption coefficient in the UV‐A region (315–380 nm). To address this limitation and enhance the absorption coefficient in the UV‐A region, Ce<jats:sup>3+</jats:sup> is incorporated into CTC NCs—advantageous owing to the high absorption coefficient of Ce<jats:sup>3+</jats:sup> in the UV‐A region, attributed to—<jats:italic>4f</jats:italic>‐<jats:italic>5d</jats:italic> orbital coupling. In addition, Ce<jats:sup>3+</jats:sup> ions sensitize the luminescence of CTC NCs and enhance the photoluminescence quantum yield from 75% to 87%. Energy transfer from Ce<jats:sup>3+</jats:sup> to Tb<jats:sup>3+</jats:sup> is investigated at different dopant ratios. Furthermore, Cs<jats:sub>3</jats:sub>CeTbCl<jats:sub>6</jats:sub> (CCTC) NCs have been utilized in white LED devices. Understanding such competitive energy transfer in lanthanide‐based perovskite‐inspired metal halides will facilitate the development of novel luminescent metal halides for lighting applications.</jats:p>

Topics

• perovskite
• impedance spectroscopy
• photoluminescence
• Cerium
• Terbium