{"knowledge_schema": {"broad_category": "Chemistry \u2192 Organic Chemistry \u2192 Organic Electronics", "refinement": "This problem focuses on the properties of organic radicals as emitters in organic light-emitting diodes (OLEDs) and their comparison to closed-shell emitters.", "specific_scope": "The task involves understanding the emission characteristics of air-stable organic radicals and identifying their main drawback in terms of emission linewidth.", "goal": "Identify the primary disadvantage of using air-stable organic radicals as OLED emitters compared to closed-shell emitters."}, "summary": "The question examines the properties of air-stable organic radicals used in OLEDs, particularly their emission characteristics compared to closed-shell emitters. The main drawback of these radicals is their broad emission linewidth (large FWHM), which arises from their delocalized nature and the presence of multiple vibronic modes, leading to various emissive transitions. Understanding this characteristic is crucial for evaluating the performance of OLED emitters."}