Solution-Obtained (NH<sub>4</sub>)<sub>3</sub>In<sub>0.95</sub>Sb<sub>0.05</sub>Cl<sub>6</sub> with High External Photoluminescence Quantum Yield and Excellent Antiquenching Properties
Na Wang, Shiqiang Hao, Yan Xiong, Mingyang Li, Kunjie Liu, Christopher Wolverton, Yonggang Wang, Jing Zhao, Quanlin Liu
Abstract
The efficient broad-band emission from low-dimensional metal halides has garnered significant interest. However, most of these materials exhibit poor stability at the operating temperature of light-emitting diodes. In this study, using the solution method (temperature lower than 90 °C), a new compound (NH 4 ) 3 In 0.95 Sb 0.05 Cl 6 was obtained with the structure in the Pnma space group featuring unit-cell parameters of a = 12.3871(4) Å, b = 24.9895(9) Å, and c = 7.7844(3) Å. (NH 4 ) 3 In 0.95 Sb 0.05 Cl 6 can be prepared by doping (NH 4 ) 2 InCl 5 ·H 2 O when the Sb 3+ feeding ratio is in the range of 30–80%. Thermal analysis reveals that (NH 4 ) 3 In 0.95 Sb 0.05 Cl 6 is stable up to 320 °C. (NH 4 ) 3 In 0.95 Sb 0.05 Cl 6 exhibits broad-band yellow-white emission with extremely high internal and external photoluminescence quantum yields of 93 and 77%, respectively. Interestingly, (NH 4 ) 3 In 0.95 Sb 0.05 Cl 6 displays remarkable resistance to thermal quenching, retaining 83% of its initial photoluminescence intensity at 80 °C. A white light-emitting diode is fabricated by combining (NH 4 ) 3 In 0.95 Sb 0.05 Cl 6 with a commercial phosphor, and a high color rendering of 92.8 was obtained. This work presents an environmentally friendly, efficient, stable UV-excited broad-band emission material for potential solid-state lighting applications.