Binary host-guest strategy enables bright and efficient lead-free zero-dimensional tin halide light-emitting diodes

Area of Science:

• Materials Science
• Optoelectronics
• Solid-State Chemistry

Background:

• Lead-free tin perovskites offer environmental benefits over lead-based alternatives.
• Progress in 3D and 2D tin perovskite LEDs (PeLEDs) is significant, but 0D tin perovskites remain underexplored for PeLED applications.
• Challenges in charge transport and injection have hindered the development of 0D tin PeLEDs.

Purpose of the Study:

• To explore the potential of 0D tin perovskites in PeLEDs.
• To overcome charge transport and injection challenges in 0D tin perovskite materials.
• To demonstrate bright and efficient 0D tin PeLEDs emitting orange and white light.

Main Methods:

• A binary host-guest strategy was employed to incorporate 0D tin bromide hybrid (HDAD)₃SnBr₈.
• A meticulously designed binary host system was utilized to facilitate charge transport.
• Device architecture was tailored to optimize performance for white light emission.

Main Results:

• Demonstrated bright and efficient 0D tin PeLEDs with maximum brightness exceeding 7500 cd/m² and external quantum efficiency over 7%.
• Achieved significant improvements in film morphology, charge carrier mobility, and carrier balance.
• Successfully realized white LEDs with a maximum luminance of 1800 cd/m².

Conclusions:

• The binary host-guest strategy effectively addresses charge transport and injection issues in 0D tin perovskites.
• This approach enables high-performance 0D tin PeLEDs with tunable emission colors (orange and white).
• 0D tin perovskites show great promise for next-generation, environmentally friendly lighting applications.