Realizing Single Chip White Light InGaN LED via Dual-Wavelength Multiple Quantum Wells
Yangfeng Li1,2, Cui Liu3, Yuli Zhang1
1Key Laboratory for Renewable Energy, Beijing Key Laboratory for New Energy Materials and Devices, Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China.
Materials (Basel, Switzerland)
|June 10, 2022
Summary
Researchers developed a single-chip white light indium gallium nitride (InGaN) light-emitting diode (LED) using dual-wavelength multiple quantum wells (MQWs). This innovation simplifies white LED production and advances high-quality illumination technology.
Area of Science:
- Solid State Physics
- Optoelectronics
- Materials Science
Background:
- Dual-wavelength multiple quantum wells (MQWs) are crucial for advanced illumination and micro-LED displays.
- Indium gallium nitride (InGaN) based light-emitting diodes (LEDs) are key components in modern lighting.
Purpose of the Study:
- To demonstrate a single-chip white light InGaN LED by manipulating dual-wavelength MQWs.
- To explore the potential of tailored MQWs for high-quality white light emission.
Main Methods:
- Fabrication of InGaN LED chips utilizing dual-wavelength MQWs (four pairs blue, one pair green).
- Employing nickel/gold (Ni/Au) as a current spreading layer.
- Characterization of light emission properties under varying injection currents (0.5 mA to 80 mA).
Main Results:
- Achieved white light emission from a single InGaN LED chip.
- Obtained chromaticity coordinates of (0.3152, 0.329) at 1 mA injection current.
- Measured a color rendering index (CRI) Ra of 60 and correlated color temperature (CCT) of 6246 K.
Conclusions:
- The dual-wavelength MQW strategy offers a promising pathway for single-chip white light LEDs.
- This approach simplifies manufacturing processes for white LEDs.
- Promotes advancements in high-quality illumination applications.
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