Related Experiment Video
Updated: Apr 17, 2026
High Resolution Phonon-assisted Quasi-resonance Fluorescence Spectroscopy
Published on: June 28, 2016
Giant Scintillation Yield Enhancement in Zero-Dimensional Halides by Exciton Confinement Manipulation
Yujie Wang1,2, Xuemin Wen1,3, Hongliang Shi4
1State Key Laboratory of Functional Crystals and Devices, ShanghaiInstitute of Ceramics, Chinese Academy of Sciences, Shanghai 201899, China.
None:
Low-dimensional halides (LDHs) with self-trapped exciton (STE) emission are promising materials for scintillation applications. Nonetheless, for almost all LDHs, the measured scintillation yield is still far below theoretical value due to severe exciton-exciton/exciton-defect interaction under ionizing radiation, despite high photoluminescence quantum yield (PLQY). Here, we reported a substantial enhancement of scintillation yield in zero-dimensional (0D) Cs3YCl6 by structural modulation. By copper(I) alloying in Cs3YCl6, the delocalized excitons in [YCl6]3- octahedra convert to strongly localized excitons within [Cu2(YCl6)3]7- clusters in (Cs8Cu)Y3Cl18, as confirmed by first-principles calculations. Temperature-dependent photoluminescence spectroscopy and kinetic results reveal a higher energy barrier for STE quenching in (Cs8Cu)Y3Cl18 than in Cs3YCl6. Benefiting from the enhanced exciton confinement effect, (Cs8Cu)Y3Cl18 exhibits a 460% enhancement in the STE-related scintillation yield. This work opens up a new strategy to enhance scintillation yield in LDHs under ionizing radiation excitation.
More Related Videos
12:57Resonance Fluorescence of an InGaAs Quantum Dot in a Planar Cavity Using Orthogonal Excitation and Detection
Published on: October 13, 2017
06:08Time-resolved Photophysical Characterization of Triplet-harvesting Organic Compounds at an Oxygen-free Environment Using an iCCD Camera
Published on: December 27, 2018
Related Concept Videos
01:26Variables Affecting Phosphorescence and Fluorescence
02:38Electrophilic Addition to Alkynes: Halogenation
Halogenation is another class of electrophilic addition reactions where a halogen molecule gets added across a π bond. In alkynes, the presence of two π bonds allows for the addition of two equivalents of halogens (bromine or chlorine). The addition of the first halogen molecule forms a trans-dihaloalkene as the major product and the cis isomer as the minor product. Subsequent addition of the second equivalent yields the tetrahalide.
04:01VSEPR Theory and the Effect of Lone Pairs
02:46Crystal Field Theory - Tetrahedral and Square Planar Complexes
Crystal field theory (CFT) is applicable to molecules in geometries other than octahedral. In octahedral complexes, the lobes of the dx2−y2 and dz2 orbitals point directly at the ligands. For tetrahedral complexes, the d orbitals remain in place, but with only four ligands located between the axes. None of the orbitals points directly at the tetrahedral ligands. However, the dx2−y2 and dz2 orbitals (along the Cartesian axes) overlap with the ligands less than...