High-Quantum-Yield [Eu(Phen)₂(NO₃)₃] Phosphor Exhibiting Zero Thermal Quenching under Real Operating Conditions...

Area of Science:

• Materials Science
• Photochemistry
• Inorganic Chemistry

Background:

• Luminescent materials are crucial for optical applications.
• Europium complexes are known for their characteristic red emission.
• Thermal stability is a key challenge for many luminescent materials.

Purpose of the Study:

• To investigate the temperature-dependent luminescence of the [Eu-(Phen)2(NO3)3] complex.
• To evaluate its thermal stability and structural properties.
• To assess its potential for thermally stable red-emitting optical applications.

Main Methods:

• Fourier-transform infrared spectroscopy (FTIR) for coordination environment.
• Thermogravimetric analysis (TGA) for thermal stability.
• Powder X-ray diffraction (PXRD) for structural analysis.
• Photoluminescence spectroscopy for luminescence properties.

Main Results:

• The complex exhibits characteristic Eu3+ emission (5D0 → 7F J transitions) under UV excitation.
• High photoluminescence quantum yield (96%) and long luminescence lifetime (1.096 ms).
• Deep-red emission with 99% color purity (CIE coordinates: x=0.66, y=0.33).
• Zero thermal quenching observed from 30 °C to 150 °C.

Conclusions:

• The [Eu-(Phen)2(NO3)3] complex demonstrates exceptional thermal robustness.
• Suppression of back-energy transfer contributes to its stability.
• The material shows significant potential for thermally stable red-emitting optical devices.