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2-Substituted vs 4-substituted-9,9′-spirobifluorene host materials for green and blue phosphorescent OLEDs: a structure–property relationship study

White OledOrganic Material ChemistryChemical EngineeringEngineeringBlue Phosphorescent OledsGreen ChemistryStructure–property Relationship StudyOrganic ChemistryChemistry