Highly efficient Mn-doped CsPb(Cl/Br)3 quantum dots for white light-emitting diodes
Chun Sun1, Le Wang1, Sijing Su1
1Tianjin Key Laboratory of Electronic Materials and Devices, School of Electronics and Information Engineering, Hebei University of Technology, 5340 Xiping Road, Tianjin, 300401, People's Republic of China.
Nanotechnology
|October 24, 2019
Summary
Researchers developed a new method for creating white light-emitting diodes (WLEDs) using perovskite quantum dots (QDs). This strategy improves light efficiency and stability for optoelectronic applications.
Area of Science:
- Materials Science
- Optoelectronics
- Nanotechnology
Background:
- All-inorganic perovskite CsPbX3 quantum dots (QDs) are promising for white light-emitting diodes (WLEDs).
- Current WLEDs using mixed perovskite colors suffer from non-uniform light distribution and significant light loss.
Purpose of the Study:
- To demonstrate a novel strategy for achieving efficient white emission using CsPb/Mn(Cl/Br)3 QDs.
- To enhance the photoluminescence quantum yield (PLQY) and optical stability of perovskite QD-based WLEDs.
Main Methods:
- Combining orange and blue emission from CsPb/Mn(Cl/Br)3 QDs to achieve white light.
- Employing an anion exchange surface engineering (AESE) strategy to treat the QDs.
- Fabricating a prototype WLED device using the engineered QDs.
Main Results:
- Achieved highly efficient white emission with a photoluminescence quantum yield (PLQY) of 94% after AESE treatment.
- AESE treatment effectively eliminated surface traps, enhancing both exciton and Mn2+ emission.
- The prototype WLED device demonstrated excellent optical stability.
Conclusions:
- The novel strategy of combining specific perovskite QD emissions and AESE is effective for high-efficiency WLEDs.
- Eliminating surface traps via AESE significantly boosts luminescence properties.
- Perovskite QDs show great potential for future optoelectronic applications due to their improved performance and stability.
