Optical Materials: Novel Properties and Engineering for Future Photonic Devices

A special issue of Photonics (ISSN 2304-6732). This special issue belongs to the section "Optoelectronics and Optical Materials".

Deadline for manuscript submissions: 30 November 2025 | Viewed by 292

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Guest Editor
Schools of Physics, Changchun University of Science and Technology, Changchun, China
Interests: electric field sensor; barium ferrite crystal waveguide; optical interferometer; surface lattice resonance; transmission loss of waveguide on the plate and thermo-optical switch
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Special Issue Information

Dear Colleagues,

The prestigious establishment of optical/photonic materials in theoretical, technological, and application research, typically including covering ferroelectric crystal thin-films, II-V/II-VI group semiconductors, silicon-based dielectric optical media, and newly emerged advanced materials such as meta-structural and graphene materials, has been attracting increasing enthusiasm in optoelectronic information systems, including optical communication, electric field/pressure sensors, astronomy, etc. In the past few decades, research on and applications of various optical materials have led to increasing achievements. Thus, this Special Issue will cover a wide range of topics related to all aforementioned optical/photonic materials.

Prof. Dr. Degui Sun
Guest Editor

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Keywords

  • isotropic optical material
  • anisotropic optical material
  • integrated optics
  • polarization
  • application

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Published Papers (1 paper)

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Research

15 pages, 2564 KiB  
Article
Effect of CaO Content on the Photoluminescence Excitation and Emission Properties of Bi2O3 and ZnO-Co-Doped Ca2+xGa4O8+x Phosphors
by Shu-Han Liao, Xiang-Chen Cheng, Fang-Tzu Hsu, Cheng-Fu Yang and Tung-Lung Wu
Photonics 2025, 12(7), 625; https://doi.org/10.3390/photonics12070625 - 20 Jun 2025
Viewed by 185
Abstract
The synthesis process employed solid-state reaction methods to produce phosphors with varying CaO contents, specifically at x values of 0, 0.2, 0.4, 0.6, 0.8, and 1.0. As the CaO content (represented by the x value) increases, the crystalline structure of Ca2+x [...] Read more.
The synthesis process employed solid-state reaction methods to produce phosphors with varying CaO contents, specifically at x values of 0, 0.2, 0.4, 0.6, 0.8, and 1.0. As the CaO content (represented by the x value) increases, the crystalline structure of Ca2+xGa4O8+x + 0.01 Bi2O3 + 0.07 ZnO compositions underwent notable transformations. X-ray diffraction was used to characterize these structural changes, and we found that CaGa2O4, CaO, Ga2O3, and Ca3Ga4O9 were clearly identified. The diffraction intensities of CaGa2O4 and CaO phases increased and those of Ga2O3 and Ca3Ga4O9 decreased with the x value. Our findings revealed that the photoluminescence excitation (PLE) spectra consistently peak around 340 nm across all samples, while the photoluminescence emission (PL) spectra exhibited slight variations within the range of 474–477 nm. Most notably, the intensity of both PLE and PL spectra demonstrated a non-linear relationship with CaO content, initially increasing with higher CaO concentration, reaching maximum intensity at x = 0.4, and subsequently decreasing as the x value continued to rise. This research provides valuable insights into the relationship between composition, crystal structure, and luminescent behavior in Ca2+xGa4O8+x phosphor systems, and the theoretical mechanisms underlying these observed trends were thoroughly discussed. Full article
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