Pathway Towards High-Efficiency Eu-doped GaN Light-Emitting Diodes.

Area of Science:

• Materials Science
• Optoelectronics
• Quantum Wells

Background:

• Gallium Nitride doped with Europium (GaN:Eu) quantum wells (QWs) are investigated for red light emission.
• Achieving high quantum efficiency in electrically-driven GaN:Eu devices remains a challenge compared to optically-pumped systems.

Purpose of the Study:

• To develop a physically intuitive current injection efficiency model for GaN:Eu QWs.
• To identify and analyze factors limiting internal quantum efficiencies (IQE).
• To clarify the lower IQE in electrically-driven vs. optically-pumped GaN:Eu devices.

Main Methods:

• Development of a current injection efficiency model.
• Analysis of limiting factors for internal quantum efficiencies (IQE).
• Comparison of electrically-driven and optically-pumped GaN:Eu devices within the model's framework.

Main Results:

• A current injection efficiency model for GaN:Eu QWs was successfully developed.
• Limiting factors for high IQE in GaN:Eu QWs were identified and analyzed.
• The discrepancy in IQE between electrically-driven and optically-pumped GaN:Eu devices was clarified.

Conclusions:

• The developed model provides a pathway to address limitations in electrically-driven GaN:Eu QW devices.
• Experimental approaches to enhance IQE in red-emitting GaN:Eu QW devices are suggested.
• Improved understanding of current injection efficiency is crucial for advancing GaN:Eu optoelectronic devices.