[Study on spectral properties of Ca2B5O9Cl : Eu prepared with hydrothermal method and solid method]

Area of Science:

• Materials Science
• Solid-State Chemistry
• Luminescence

Context:

• Investigating novel phosphors for advanced lighting and display technologies.
• Understanding the influence of synthesis parameters on material properties.

Purpose:

• To explore the effects of preparation methods (hydrothermal vs. high-temperature solid), excitation conditions, and europium (Eu) ion concentration on the spectral characteristics of Ca2B5O9Cl:Eu phosphors.
• To correlate preparation conditions with crystal morphology and luminescence behavior.

Summary:

• The hydrothermal method produced Ca2B5O9Cl:Eu phosphors exhibiting Eu3+ emission (5D0 → 7FJ) under 254 nm excitation and Eu2+ emission (4f65d1 → 8S7/2) under 365 nm excitation.
• The high-temperature solid method resulted primarily in Eu2+ emission (4f65d1 → 8S7/2) under 365 nm excitation, with minimal Eu2+ and Eu3+ emissions under 254 nm excitation.
• Europium ion concentration had a minor effect, while preparation method and excitation wavelength strongly influenced spectral properties. Scanning Electron Microscopy (SEM) confirmed well-formed crystals with appropriate particle sizes (0.82-1.06 µm).

Impact:

• Provides insights into tailoring luminescence properties of Ca2B5O9Cl:Eu phosphors through controlled synthesis.
• Highlights the importance of preparation techniques and excitation sources for optimizing phosphor performance in optoelectronic applications.
• Demonstrates the potential of hydrothermal synthesis for achieving specific emission characteristics in rare-earth-doped phosphors.