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Spirophenylacridine‐2,7‐(diphenylphosphineoxide)‐fluorene: A Bipolar Host for High‐Efficiency Single‐Layer Blue Phosphorescent Organic Light‐Emitting Diodes
Author(s) -
Lucas Fabien,
Ibraikulov Olzhas A.,
Quinton Cassandre,
Sicard Lambert,
Heiser Thomas,
Tondelier Denis,
Geffroy Bernard,
Leclerc Nicolas,
RaultBerthelot Joëlle,
Poriel Cyril
Publication year - 2020
Publication title -
advanced optical materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.89
H-Index - 91
ISSN - 2195-1071
DOI - 10.1002/adom.201901225
Subject(s) - phosphorescent organic light emitting diode , phosphorescence , materials science , fluorene , quantum efficiency , oled , homo/lumo , optoelectronics , diode , electrical efficiency , layer (electronics) , molecule , nanotechnology , optics , chemistry , power (physics) , physics , polymer , fluorescence , organic chemistry , quantum mechanics , composite material
Herein, a high‐efficiency host material for single‐layer phosphorescent organic light‐emitting diodes (SL‐PhOLEDs) is reported. This host material is synthesized via an efficient approach and is constructed on the association of an electron‐rich phenylacridine unit connected by a spiro carbon atom to an electron‐deficient 2,7‐bis(diphenylphosphineoxide)‐fluorene. In addition to a high E T value and adequate highest occupied molecular orbital/lowest unoccupied molecular orbital energy levels, the key point in this molecular design is the suitable balance between hole and electron mobilities, which leads to a high‐performance blue SL‐PhOLED with an external quantum efficiency of 17.6% (current efficiency = 37.8 cd A −1 and power efficiency = 37.1 lm W −1 ) and a low V on of 2.5 V. This performance shows that the molecular design of the present host fulfills the criteria required for high‐efficiency SL‐PhOLEDs. The present performance is one of the highest reported to date for blue SL‐PhOLEDs and more importantly shows the potential of such a molecular design to reach very high‐performance single‐layer devices.