Self-formed C-dot-based 2D polysiloxane with high photoluminescence quantum yield and stability

Area of Science:

• Materials Science
• Nanotechnology
• Optoelectronics

Background:

• Carbon dots (C-dots) and their composites often suffer from poor photostability and low solid-state photoluminescence quantum yields (PLQYs).
• These limitations hinder their widespread application in advanced optical devices.

Purpose of the Study:

• To synthesize a novel 2D hybrid material for improved stability and photoluminescence.
• To explore the potential of Si-doped carbon dots within a polysiloxane matrix for optical applications.

Main Methods:

• A self-assembly approach was employed to synthesize a polysiloxane embedded with Si-doped carbon dots (P-E-Si-CDs).
• Characterization of the hybrid composite's photophysical and thermal properties.
• Fabrication of light-emitting diodes (LEDs) using the synthesized material.

Main Results:

• The P-E-Si-CDs hybrid composite demonstrated broadband blue-green fluorescence emission.
• Outstanding photostability, high thermal stability, and a high PLQY of 82.8% were achieved.
• Dual fluorescent emissions indicated the formation of two closed-loop fluorophores.
• Fabricated LEDs exhibited safe warm white light and adjustable white emission with a high color rendering index (up to 91).

Conclusions:

• The developed Si-CD-based hybrid composite offers a novel strategy for overcoming stability and PLQY challenges.
• The material shows significant promise for commercial applications in LED lighting.
• This work paves the way for advanced, stable, and efficient optical devices.