Bulk assembly of a 0D organic antimony chloride hybrid with highly efficient orange dual emission by self-trapped states

• Published in: Journal of materials chemistry. C, Materials for optical and electronic devices Vol. 9; no. 36; pp. 12184 - 1219
• Main Authors: Peng, Hui, Tian, Ye, Wang, Xinxin, Huang, Tao, Xiao, Yonghao, Dong, Tiantian, Hu, Jinming, Wang, Jianping, Zou, Bingsuo
• Format: Journal Article
• Language: English
• Published: Cambridge Royal Society of Chemistry 28.09.2021
• Subjects: Antimony; Color temperature; Crystal structure; Crystallography; Emission; Europium; Excitation; Excitons; Flexible structures; Halides; Lead compounds; Lead free; Light emitting diodes; Metal halides; Optical properties; Optoelectronic devices; Phosphors; Photoluminescence; Raman spectra; Single crystals; Temperature dependence; Toxicity; White light
• ISSN: 2050-7526; 2050-7534
• DOI: 10.1039/d1tc02906a

Low-dimensional organic-inorganic hybrid metal halides have drawn intense attention due to their flexible structures and outstanding optical properties. However, the toxicity of lead halides hinders their future application in optoelectronic devices. Herein, we report a zero-dimensional (0D) lead-free compound of (TPA) 2 SbCl 5 (TTA + = tetrapropylammonium cation) single crystals (SCs), which crystallizes in a triclinic system with P 1&cmb.macr; symmetry. Interestingly, (TPA) 2 SbCl 5 exhibits a single broad orange emission band at 610 nm under low-energy excitation ( e.g. , 375 nm) with a high photoluminescence quantum yield (PLQY) of 95.3%, while it shows a dual-band emission profile with an additional narrow emission band at 466 nm at high-energy excitation ( e.g. , 300 nm), which is formed by the transformation of the doublet of spin-orbit interactions into two individual STEs. The Raman spectra supplied clear evidence for the self-trapped exciton (STE) with clear multiphonon modes in (TPA) 2 SbCl 5 , which reflects its strong nonlinear electron-phonon coupling. The emission mechanism for the temperature-dependent dual emission can be attributed to the radiative transitions of singlet STEs and triplet STEs in [SbCl 5 ] 2− clusters. Moreover, a white-light-emitting diode (WLED) was also fabricated by mixing (TPA) 2 SbCl 5 with green (Ba 2 SiO 4 :Eu 2+ ) and blue (BaMgAl 10 O 17 :Eu 2+ ) phosphors, which exhibited CIE coordinates of (3.48, 3.50), a correlated color temperature (CCT) of 4900 K, and a color rendering index (CRI) of 93.2. Our achievements illustrate that the lead-free compound of (TPA) 2 SbCl 5 has great potential in solid-state lighting. Here, we report a new zero-dimensional organic antimony chloride hybrid of (TPA) 2 SbCl 5 (TTA + = tetrapropylammonium cation) single crystals, which exhibits highly efficient broadband orange emission with a high PLQY of 95.3%.