Affiliation:
1. College of Physics Qingdao University Ningxia Road No. 308 Qingdao 266071 China
2. College of Materials Science and Engineering Qingdao University Ningxia Road No. 308 Qingdao 266071 China
3. College of Physics University-Industry Joint Center for Ocean Observation and Broadband Communication Qingdao University Qingdao 266071 China
Abstract
Cs3Cu2Cl5 is unstable owing to ionic migration and lattice decomposition in the atmosphere. In addition, obtaining large bulk single crystals of Cs3Cu2Cl5 is challenging. Herein, a novel strategy is proposed for synthesizing a Cs3Cu2Cl5 single crystal that exhibits excellent crystallinity and photoluminescence (PL) properties using an antisolvent‐assisted method. Na+ is doped into the Cs3Cu2Cl5 lattice to replenish the lattice defects caused by chlorine vacancies, thus leading to stronger chemical interactions between Cu+ and Cl− ions. Moreover, Na+ doping circumvents ionic migration and lattice decomposition, thereby enhancing the PL intensity and maintaining the long‐term stability of Cs3Cu2Cl5 in the atmosphere. Incorporating 10% Na+ into the Cs3Cu2Cl5 lattice enhances the PL intensity by 18%, and the high‐stability PL can maintain more than 48.5% of the PL intensity after 90 d in an atmospheric environment. In addition, a white light‐emitting device (LED) is fabricated using the 10% Na+‐doped Cs3Cu2Cl5 crystal powder and it exhibits a high color‐rendering index (93.7) and correlated color temperature (7120 K). Additionally, it exhibits superior stability, even at a high temperature of 120 °C. Thus, the excellent high‐temperature stability of Cs3Cu2Cl5 can promote its practical application in LED.
Funder
National Natural Science Foundation of China
Natural Science Foundation of Shandong Province
Subject
Pharmacology (medical),Complementary and alternative medicine,Pharmaceutical Science