Related Experiment Video
Updated: Mar 27, 2026

An Electrochemical Cholesteric Liquid Crystalline Device for Quick and Low-Voltage Color Modulation
Published on: February 27, 2019
Dimensionality-Mixed Phases Facilitate Chirality Transfer and Spin-Orbit Coupling for Chiral Perovskite Red Spin-LEDs
Sheng Tao1,2,3, Linze Jiang1,2,3, Liqun Liu4
1Key Laboratory of Luminescence and Optical Information, Ministry of Education, School of Physical Science and Engineering, Beijing Jiaotong University, Beijing 100044, China.
None:
Chiral hybrid perovskite spin-light emitting diodes (spin-LEDs) adopt spin filtration technology based on chirality-induced spin selectivity (CISS), while circularly polarized electroluminescence (CP-EL) arises from a direct conversion of spin angular momentum into light. The current obstacle lies in elevating the dissymmetry factors for circularly polarized luminescence in quasi-2D chiral-achiral synergistic systems. Herein, chiral organic ligands R-/S-methylbenzylamine (R-/S-MBA) were incorporated into lead-iodide octahedral inorganic frameworks, forming dimensional-mixing phases. An effective chirality transfer through the visible light region and chirality-induced spin-orbit coupling (CISOC) strengths of up to 0.8081 eV·Å were achieved for ultrathin red emitters. Without spin injection, prominent dissymmetry factors of CP-EL approaching 20% were obtained for R-/S-MBA-based bright red single-junction spin-LEDs. Our work greatly promotes the development high-performance red chiral perovskite spin-LEDs.
Related Concept Videos
Prochirality
Stereoisomerism
Isomers are different chemical species that have the same chemical formula.
Transition metal complexes often exist as geometric isomers, in which the same atoms are connected through the same types of bonds but with differences in their orientation in space. Coordination complexes with two different ligands in the cis and trans positions from a ligand of interest form isomers. For example, the octahedral [Co(NH3)4Cl2]+ ion has two isomers (Figure 1) In the cis...
Photochemical Electrocyclic Reactions: Stereochemistry
Selection Rules: Photochemical Activation
Chirality at Nitrogen, Phosphorus, and Sulfur
A consequence of chirality is the need for enantiomeric resolution. While this is theoretically possible for all...
Thermal Electrocyclic Reactions: Stereochemistry
Selection Rules: Thermal Activation
Conjugated systems containing an even number of π-electron pairs undergo a conrotatory ring closure. For example, thermal electrocyclization of (2E,4E)-2,4-hexadiene, a conjugated diene containing two π-electron pairs, gives trans-3,4-dimethylcyclobutene.
Stereoisomerism of Cyclic Compounds

