(C16H28N)2SbCl5: A new lead-free zero-dimensional metal-halide hybrid with bright orange emission

Abstract

Zero-dimensional (0D) metal halides are in a blossoming status for their fascinating optoelectronic properties. Herein, an antimony-based metal halide of (C 16 H 28 N) 2 -SbCl 5 (C 16 H 28 N + = benzyltripropylammonium cations), where the isolated [SbCl 5 ] 2− clusters are surrounded by C 16 H 28 N + to form a 0D square-pyramidal structure, was synthesized and investigated. The (C 16 H 28 N) 2 SbCl 5 exhibited a broadband orange emission at 633 nm upon the low-energy irradiation (400 nm) with a near-unity photoluminescence quantum efficiency (97.8%). Interestingly, (C 16 H 28 N) 2 SbCl 5 showed an additional emission peak at 477 nm upon the higher-energy irradiation (300 nm), which is attributed to the transformation of the doublet of spin-orbit couplings into two independent self-trapped excitons (STEs). Temperaturedependent Raman spectra clearly revealed the characteristics of multi-phonon coupling, demonstrating a strong anharmonic electron-phonon interaction in (C 16 H 28 N) 2 SbCl 5 . Temperature-dependent emission spectra and density functional theory results illustrated that the observed dual-band emission originated from singlet and triplet STEs in [SbCl 5 ] 2− units. Combined with the efficient emission and excellent stability of (C 16 H 28 N) 2 SbCl 5 , a stable white-light-emitting diode with an ultra-high color rendering index of 96.6 was fabricated.

Green Triplet Self-Trapped Exciton Emission in Layered Rb3Cd2Cl7:Sb3+ Perovskite: Comparison with RbCdCl3:Sb3+

“…Similarly, in pristine Sb-based luminescent materials, such as (C 16 H 28 N) 2 SbCl 5 and (TMA) 2 SbCl 5 ·DMF (TMA = N­(CH 3 ) 3 , DMF = HCON­(CH 3 ) 2 ), the PDOS shows that the CBM is mainly composed of organic molecules, Sb-s and Cl-p orbitals. , All three materials above exhibit doublet emission from the singlet and triplet STEs, as observed simultaneously. That is similar to the case of Sb-doped RbCdCl 3 , in which the SbCl 6 3– cluster is the STE center for emission with usual double bands.…”

A Zero-Dimensional Organic Lead Bromide of (TPA)2PbBr4 Single Crystal with Bright Blue Emission

“…The Raman bands at 39, 51 and 101 cm −1 can be attributed the A g , B 1g and B 2g mode of the layered structure of PbBr 2 [48]. Clearly, the Raman bands at high temperature move towards a low wavenumber, which may be caused by the lattice expansion [49], and 3D lead halide perovskites were found to exhibit the same phenomena [50]. Another interesting feature is that the Raman mode intensity decreases significantly at low temperature, which indicates that the electron-phonon interactions become stronger at high temperature.…”

Spacer Switched Two-Dimensional Tin Bromide Perovskites Leading to Ambient-Stable Near-Unity Photoluminescence Quantum Yield

“…Under similar conditions, the PLQY of 6N6-DJ is significantly affected. The PLQY of 8N8-DJ excels over the reported results of Sn-based layered perovskites (Table S9), ,,,− Pb-free organic–inorganic composites (Table S10), ,− and Pb-based layered perovskites (Table S11), ,− while that of the unstable 8N-RP perovskite is still comparable to the best reports. Our experimental results assert that 8N8-DJ is several notches above the RP counterpart (8N-RP), the analogous 8N8PbBr 4 , and the DJ perovskites with shorter spacer lengths in terms of its PLQY and ambient stability.…”