Open AccessWhen Poor Light‐Emitting Spiro Compounds in Solution Turn into Emissive Pure Layers in Organic Light‐Emitting Diodes: The Key Role of Phosphine Substituents
Author(s) -
Tourneur Pauline,
Lucas Fabien,
Brouillac Clément,
Quinton Cassandre,
Lazzaroni Roberto,
Olivier Yoann,
Viville Pascal,
Poriel Cyril,
Cornil Jérôme
Publication year - 2022
Publication title -
advanced photonics research
Language(s) - English
Resource type - Journals
ISSN - 2699-9293
DOI - 10.1002/adpr.202200124
Subject(s) - oled , diphenylphosphine oxide , phosphine oxide , quantum yield , common emitter , photochemistry , fluorene , materials science , fluorescence , intermolecular force , diode , optoelectronics , chemistry , layer (electronics) , nanotechnology , phosphine , molecule , polymer chemistry , organic chemistry , polymer , optics , physics , composite material , catalysis
Spiro compounds are widely used as host matrices in organic light‐emitting diodes (OLEDs). Here, inspired by the recent developments in thermally activated delayed fluorescence (TADF) materials, the potential as a light emitter of two spiro‐configured organic semi‐conductors is investigated, constructed by the association of quinolinophenothiazine (QPTZ) or indoloacridine (IA) as the electron‐rich fragment and diphenylphosphine oxide fluorene as the electron‐poor fragment. By comparison with structural analogues lacking phosphine oxides, the crucial role played by these electron‐accepting substituents not only on the photo‐physical properties but also on the device performances is evidenced. Despite a very low quantum yield in solution, these two compounds unexpectedly display good emission properties when incorporated as a pure layer in OLEDs, thus highlighting the role of intermolecular effects.