Quantifying the Accuracy and Precision of the Transition Dipole Moment Alignment from Realistic Angular Emission Data

Area of Science:

• Materials Science
• Optoelectronics
• Quantum Mechanics

Background:

• Optoelectronic device efficiency relies on photoluminescent transition dipole moment (PTDM) orientation.
• Current methods for quantifying PTDM orientation involve fitting angular emission patterns, but their accuracy and precision are not well understood.

Purpose of the Study:

• To quantify the inherent accuracy and precision of determining PTDM orientation.
• To identify factors influencing the uncertainty in PTDM orientation fitting.
• To develop methods for improving the accuracy of PTDM orientation prediction in optoelectronic materials.

Main Methods:

• Generated artificial datasets with varying PTDM alignments, refractive indices, and film thicknesses.
• Employed statistical models to analyze fit accuracy and calculate confidence intervals.
• Incorporated realistic nonidealities into datasets to simulate experimental conditions.
• Developed and tested a novel weighting mask to reduce fitting inaccuracies.

Main Results:

• Confidence intervals for PTDM orientation fitting are inconsistent, increasing with horizontal dipole alignment and higher refractive indices.
• Accurate fitting necessitates precise knowledge of film parameters or computationally intensive methods.
• Realistic experimental nonidealities can lead to significant (10-30°) errors in predicted PTDM alignment.
• The developed weighting mask reduced inaccuracies to within a few degrees for most cases.

Conclusions:

• The accuracy of PTDM orientation fitting is inherently limited and depends on material properties.
• A new weighting mask framework significantly improves the accuracy of PTDM orientation quantification.
• This work provides a pathway for more reliable predictions of material properties and optoelectronic device performance.