Yun Xiangyan, Zhu Yanrong, Wang Yu, Fan Zutao, Zhou Kang, Hu Hanlin, Zhong Haizhe, Li Henan, Shi Yumeng
International Collaborative Laboratory of 2D Materials for Optoelectronics Science and Technology of Ministry of Education, Institute of Microscale Optoelectronics, Shenzhen University, Shenzhen 518060, P. R. China.
Key Laboratory of Luminescence and Optical Information, Ministry of Education, Institute of Optoelectronic Technology, Beijing Jiaotong University, Beijing 100044, China.
Inorg Chem. 2024 Sep 30;63(39):18304-18312. doi: 10.1021/acs.inorgchem.4c03218. Epub 2024 Sep 18.
With suitable electron-phonon coupling strength, a near-unity broadband photoluminescence quantum yield (PLQY) can be achieved in organic-inorganic hybrid metal halides (OIHMHs) via self-trapped exciton (STE) emission. However, it is still challenging to obtain high-quality red emission from OIHMHs with a desirable emission wavelength and high chemical stability, which hinders their practical application in high-performance displays, plant-growth lighting, and biomedical imaging. Herein, a series of hafnium-based zero-dimensional (TPP)HfCl·4CHN (TPP: tetraphenylphosphonium) single crystals with different Sb doping levels are synthesized. The Sb-doped (TPP)HfCl·4CHN shows dual-band red emission with a full width at half-maximum of 178 nm and a high PLQY of 91.09%. This broad dual-band emission originates from dopant-induced extrinsic free excitons and STEs. Furthermore, (TPP)HfCl·4CHN:Sb was employed as a luminescence converter in a light-emitting diode (LED) for plant growth regulation. A correlated color temperature of 4055 K and a color rendering index of 82.13 were achieved upon excitation of the LED at 365 nm. These results provide fundamental perspectives on the emission behavior of Sb-doped OIHMHs and illustrate their promise for use in plant-growth lighting.
在合适的电子 - 声子耦合强度下，通过自陷激子（STE）发射，有机 - 无机杂化金属卤化物（OIHMHs）可实现接近单位的宽带光致发光量子产率（PLQY）。然而，从具有理想发射波长和高化学稳定性的OIHMHs中获得高质量的红色发射仍然具有挑战性，这阻碍了它们在高性能显示器、植物生长照明和生物医学成像中的实际应用。在此，合成了一系列具有不同Sb掺杂水平的铪基零维（TPP）HfCl·4CHN（TPP：四苯基鏻）单晶。Sb掺杂的（TPP）HfCl·4CHN呈现出半高宽为178 nm的双波段红色发射和91.09%的高PLQY。这种宽双波段发射源于掺杂剂诱导的外在自由激子和STE。此外，（TPP）HfCl·4CHN:Sb被用作发光二极管（LED）中的发光转换器用于植物生长调节。在365 nm激发LED时，实现了4055 K的相关色温以及82.13的显色指数。这些结果为Sb掺杂的OIHMHs的发射行为提供了基本观点，并说明了它们在植物生长照明中的应用前景。
