# SICCAS and FZU boost zero-dimensional halide scintillation yield by 460% via copper alloying

- Published: 2026-11-07 03:55 UTC
- Section: Machines & Making › Materials science
- Tags: halide scintillators, Cs8CuY3Cl18, self trapped excitons, scintillation yield, X ray imaging
- URL: https://realtech.media/news/rt-fc66ecbcf75d565825f6357a_siccas_and_fzu/

**Structural modulation in zero-dimensional metal halides raises exciton confinement, achieving 10,700 photons per MeV under X-ray excitation.**

![SICCAS and FZU boost zero-dimensional halide scintillation yield by 460% via copper alloying](https://realtech.media/media/2026/11/7b4033995c4d191d.jpg)
*Savannah River Site, Wikimedia Commons, Public domain*

A joint research team from the Shanghai Institute of Ceramics of the Chinese Academy of Sciences, the FZU–Institute of Physics of the Czech Academy of Sciences, and the Northwest Institute of Nuclear Technology has developed a method to improve the light yield of zero-dimensional metal halide scintillators, according to a study published in Research. By introducing copper(I) into the zero-dimensional halide Cs₃YCl₆, the scientists synthesized (Cs₈Cu)Y₃Cl₁₈, achieving an approximately 460% increase in self-trapped exciton scintillation yield [1].

Scintillators convert ionizing radiation into detectable light, but low-dimensional metal halides typically suffer from non-radiative energy losses under ionizing radiation due to exciton–exciton and exciton–defect interactions, despite demonstrating high photoluminescence quantum yields under optical excitation [1].

## Exciton localization and emission yield

Introducing copper(I) reorganized the original isolated [YCl₆]³⁻ octahedral units into paddle-wheel-shaped [Cu₂(YCl₆)₃]⁷⁻ clusters [1]. First-principles calculations confirmed that this structural alteration converts delocalized excitons into strongly localized states confined within the clusters [1]. Temperature-dependent photoluminescence spectroscopy and kinetic measurements indicated that (Cs₈Cu)Y₃Cl₁₈ features a higher energy barrier for self-trapped exciton quenching compared to the unmodified Cs₃YCl₆ matrix [1].

Under X-ray excitation, the estimated scintillation yield increased from approximately 1,900 photons per megaelectronvolt for parent Cs₃YCl₆ to 10,700 photons per megaelectronvolt for (Cs₈Cu)Y₃Cl₁₈, as calibrated against a commercial bismuth germanate reference [1]. The two halides possess comparable X-ray absorption coefficients, indicating that the enhanced yield stems from the suppression of quenching mechanisms rather than absorption variations [1].

## Imaging screens and afterglow performance

The synthesized material exhibited low afterglow, retaining a residual signal of approximately 0.05% at 10 milliseconds after switching off the X-ray source, compared to roughly 6% in a standard CsI:Tl reference [1]. The estimated detection limit reached 147 nanograys in air per second under the reported testing conditions [1].

To demonstrate potential applications, the team embedded scintillator powder into polydimethylsiloxane to produce flexible composite screens [1]. The prototype achieved a spatial resolution of 14.6 line pairs per millimeter at a modulation transfer function of 0.2 [1]. In laboratory proof-of-concept tests, the screen tracked flowing barium contrast liquid in tubing and monitored the phase transition of a bismuth–indium–tin alloy at 480 kelvin, though the researchers noted that the crystals remain moisture sensitive and require dry operating conditions [1].

## Sources

1. [Research](https://doi.org/10.34133/research.1230)
2. [EurekAlert](https://www.eurekalert.org/news-releases/1150864)

---

Source: RealTech, realtech.media — https://realtech.media/news/rt-fc66ecbcf75d565825f6357a_siccas_and_fzu/