Long-term stable stacked CsPbBr₃ quantum dot films for highly efficient white light generation in LEDs

Area of Science:

• Materials Science
• Optoelectronics
• Solid-State Chemistry

Background:

• Perovskite quantum dots (QDs) offer tunable optoelectronic properties.
• Developing efficient white light-emitting diodes (WLEDs) is crucial for energy-saving illumination.
• Cesium lead bromide (CsPbBr3) perovskites are promising for light emission applications.

Purpose of the Study:

• To develop highly efficient ethyl cellulose-based films incorporating CsPbBr3 perovskite quantum dots.
• To investigate the performance of these films for white light generation in LED applications.
• To enhance the luminous efficacy of InGaN blue chips using red phosphors.

Main Methods:

• Fabrication of ethyl cellulose films embedded with CsPbBr3 perovskite quantum dots.
• Integration of these films with a Strontium-based red phosphor (Sr2Si5N8:Eu2+) onto an Indium Gallium Nitride (InGaN) blue chip.
• Characterization of the luminous efficacy of the fabricated white light-emitting diode (WLED) device.

Main Results:

• The composite films demonstrated high efficiency for white light generation.
• A luminous efficacy of 67.93 lm W−1 was achieved at a current of 20 mA.
• The combination of CsPbBr3 QDs and Sr2Si5N8:Eu2+ phosphor on an InGaN blue chip resulted in efficient WLED performance.

Conclusions:

• Ethyl cellulose-based CsPbBr3 perovskite QD films are highly effective for WLED applications.
• The developed WLED exhibits excellent luminous efficacy, showing potential for commercial lighting.
• This study highlights a promising strategy for advanced optoelectronic device development.