The relationship between basic group resonance and quantum yield of high efficiency red light fluorescent solutions

Area of Science:

• Materials Science
• Environmental Chemistry
• Optoelectronics

Background:

• Rare earth elements and heavy metals pose environmental risks.
• Developing sustainable alternatives for fluorescent materials is crucial.

Purpose of the Study:

• To create rare-earth-element-free fluorescent films using a solution method.
• To investigate the effect of solvent polarity on the C≡N functional group in DCJTB.
• To achieve high quantum yield in fluorescent films.

Main Methods:

• Solution processing of fluorescent films (10 μm thickness).
• Fourier transform infrared spectroscopy (FTIR) to analyze the C≡N functional group.
• Humidity testing (55.1% RH) post-encapsulation.

Main Results:

• Solvent type influences the C≡N resonance position (2196 cm⁻¹).
• Polar effects impact the functional group, correlating with quantum yield.
• Achieved a fluorescent solution with 12.8 cm⁻¹ resonance displacement and 81.3% quantum yield.
• Developed a fluorescent film with 84.8% quantum yield.

Conclusions:

• Solution-processed, rare-earth-element-free fluorescent films offer an environmentally safer alternative.
• Solvent engineering is key to optimizing fluorescent properties and quantum yield.
• The developed films demonstrate stable performance and high efficiency.