Dispirocycles: Platforms for the Construction of High‐Performance Host Materials for Phosphorescent Organic Light‐Emitting Diodes

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Spirocyclic compounds such as 9,9′‐spirobifluorene (SBF) are becoming more and more attractive for use as host materials in organic optoelectronic devices. Herein, two dispirocycles, namely, dispiro[fluorene‐9,9′‐anthracene‐10′,9′′‐fluorene] and 10,10′′‐diphenyl‐10H,10′′H‐dispiro[acridine‐9,9′‐anthracene‐10′,9′′‐acridine], were used for the construction of host materials 1–4. The attached triphenylamino group determines the thermal, photophysical, electrochemical, and charge‐transport properties, and therefore they have different electroluminescent performances. The device based on dispiro[fluorene‐9,9′‐anthracene‐10′,9′′‐fluorene] (2) and 10,10′′‐diphenyl‐10H,10′′H‐dispiro[acridine‐9,9′‐anthracene‐10′,9′′‐acridine] (3) molecular platforms exhibited external quantum efficiencies of greater than 21 % with a very high power efficiency (≈100 lm W−1). These results demonstrate the potential of extending the application of dispirocyclic molecular platforms with inherent rigidity for developing highly efficient host materials for organic light‐emitting diodes.