Single‐Component White‐Light Emitters with Excellent Color Rendering Indexes and High Photoluminescence Quantum Efficiencies

• DOI: 10.1002/adom.202101640
• Publication Date: 2021-11-02T04:39:06Z
• Authors: Linyuan Lian; Song Wang; Huaiyi Ding; Guijie Liang; Yong‐Biao Zhao; Haisheng Song; Xinzheng Lan; Jianbo Gao; Rong Chen; Daoli Zhang; Jianbing Zhang
• Keywords: Color rendering index; Color temperature; Visible spectrum

Abstract Broadband white‐light emissions from low‐dimensional organic metal halides have received great attention for applications in energy‐efficient lighting and displays. However, the simultaneous realization of excellent color rendering indexes (CRIs) high photoluminescence quantum efficiencies (PLQEs) single‐component emitters remains a challenge. Here, unique 0D copper iodide (TPA)CuI 2 (TPA = tetrapropylammonium) is developed, which edge‐sharing double trigonal planar [Cu I 4 ] 2− dimers are surrounded by cations TPA + , forming core/shell structures at molecular level. These single crystals exhibit dual‐band emission covering entire visible spectrum with PLQE 84.4% an CRI 91.3. In addition, nanocrystals successfully synthesized optical properties similar to those single‐crystal counterparts. Detailed photophysical studies reveal that originates two self‐trapped emitting states dimers, whose populations strongly dependent on temperature. The promising as efficient phosphors demonstrated light‐emitting diode Commission Internationale de l'Eclairage coordinate (0.31, 0.33).