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Phosphorescent Light‐Emitting Transistors: Harvesting Triplet Excitons
Author(s) -
Namdas Ebinazar B.,
Hsu Ben B. Y.,
Liu Zehua,
Lo ShihChun,
Burn Paul L.,
Samuel Ifor D. W.
Publication year - 2009
Publication title -
advanced materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 10.707
H-Index - 527
eISSN - 1521-4095
pISSN - 0935-9648
DOI - 10.1002/adma.200900919
Subject(s) - phosphorescence , materials science , phosphorescent organic light emitting diode , optoelectronics , exciton , brightness , singlet state , photochemistry , polymer , quantum efficiency , fluorescence , optics , atomic physics , condensed matter physics , physics , chemistry , excited state , composite material
Phosphorescent light‐emitting transistors , in which light emission from singlet and triplet energy levels is harvested using solution‐processed materials (see figure), are presented. While a green phosphorescent dendrimer exhibits an external quantum efficiency of 0.45% at 480 cd m −2 , a red polymer/phosphorescent small‐molecule blend produces a brightness exceeding 30 cd m −2 with a relatively high hole mobility of 2.5 × 10 −2 cm 2 V −1 s −1 .