Publication date: 16th July 2025
CsPbBr3 perovskite nanocrystals (PNCs) exhibit remarkable properties, including high photoluminescence quantum yield (PLQY), narrow emission linewidth, and size- and composition-tunable bandgap, making them promising emitters for light-emitting diodes (LEDs). While PLQY and charge carrier transport have been extensively studied, the orientation of the emissive transition dipole moment (TDM), which strongly influences light outcoupling efficiency has received limited attention. Horizontal alignment of TDMs is particularly desirable to minimize losses via total internal reflection in device structures. In this work, variable angle spectroscopic ellipsometry (VASE) was used to determine the complex refractive index of high-quality, homogeneous CsPbBr₃ nanocrystal films. This enabled accurate optical modeling for subsequent angular dependent photoluminescence (ADPL) measurements, which were employed to extract the TDM orientation. Moreover, recognizing that the dielectric environment can affect TDM alignment, ADPL studies were also performed on CsPbBr₃ films incorporating organic transport layers. Comprehensive TDM characterization is essential for improving light outcoupling efficiency and advancing high-performance perovskite nanocrystal LEDs (PeLEDs), where optimizing PLQY, carrier balance, and TDM orientation together is key to achieving high external quantum efficiency
The authors would like to thank Quinten A. Akkerman and Anna Abfalterer from LMU, Munich for providing the perovskite nanocrystals for this study.
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