Notable Broad Dielectric Relaxation and Highly Efficient Red Photoluminescence in a Perovskite-Type Compound: (N-Methylpyrrolidinium)MnCl₃

Abstract

Multifunctional-material-integrated various properties have been an attractive research field. In spite of persistent explorations into such materials, the conditions of coexistence are still confused. Organic-inorganic hybrid compounds are appropratie for designing these materials because of both their rich properties and flexible compositions. Here, a perovskite-type organic-inorganic hybrid compound, (Hmpy)MnCl (1; Hmpy = N-methylpyrrolidinium), with temperature, light, and electric stimuli-response characteristics has been rationally designed and synthesized. This hybrid compound shows a dielectric anomaly, a broad dielectric dispersion of the temperature range from 296 to 400 K, and brilliant red fluorescence at 632 nm with a high quantum yield of 54.54% under UV excitation. The coexistence of temperature, optical, and electric multiple stimuli-response properties in 1 demonstrates that our finding has a profound influence on the further exploration of the novel multifunctional materials.

Highly Efficient and Uncommon Photoluminescence Behavior Combined with Multiple Dielectric Response in Manganese(II) Based Hybrid Phase Transition Compounds

“…The excitation (PLE) spectra of the three samples have a similar profile from 300 nm to 515 nm (Figure b, 5d and 5f). Two closely successive strong peaks (363 nm and 376 nm), which belong to 6 A 1g (S)→ 4 E 1g (D) and 6 A 1g (S)→ 4 T 2g (D) transitions and two successive peaks (437 nm and 454 nm) are attributable to 6 A 1g (S)→ 4 T 2g (G) and 6 A 1g (S)→ 4 T 1g (G) transitions of Mn 2+ ions can be found . However, after the 515 nm, a smooth unobvious broad peak of 2 and a very obvious peak of 3 due to 6 A 1g (S)→ 4 T 1g (G) transition of Mn 2+ ions are observed located at 525 nm, where compound 1 shows a straight line.…”

Organic–inorganic metal halide hybrids beyond perovskites

“…This environmentally friendly 1D metal halide hybrid has other features that make them highly attractive for optoelectronic applications, including moisture stability, a long room-temperature PL lifetime, and photoconductive behavior. 1D structures containing transition metal manganese (Mn) have also been studied recently [13,[125][126][127][128]. These Mn-based 1D hybrids were reported to exhibit bright photoluminescence originating from the (t 2g ) 3 (e g ) 2 -(t 2g ) 4 (e g ) 1 electronic transition of Mn 2+ ions with a high quantum yield under UV excitation.…”

Tuning the Crystal Structure and Luminescence of Pyrrolidinium Manganese Halides via Halide Ions

“…While, in the octahedral (Oh) coordinated AMnX 3 , MnX 6 4− octahedra face‐share to form linear chains. The Mn–Mn distance is largely reduced which significantly affects d‐d transition rule and transition energy, thus the octahedral coordinated AMnX 3 shows orange to red emission …”