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White Dendrimer Organic Light Emitting Diodes: Exciton Formation and Transfer
Author(s) -
Reventlow Lorenz Graf,
Jiang Wei,
Stoltzfus Dani M.,
Russell Steven M.,
Burn Paul L.,
Colsmann Alexander
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.202001289
Subject(s) - oled , materials science , exciton , electroluminescence , phosphorescence , dendrimer , optoelectronics , diode , photochemistry , optics , fluorescence , nanotechnology , chemistry , polymer chemistry , physics , layer (electronics) , quantum mechanics
In this work solution‐processed organic white‐light emitting diodes comprising a blend of red and blue phosphorescent dendrimers are presented. In contrast to common small molecule blended‐dye organic light emitting diodes (OLEDs), the bulky dendrons between the light emitting moieties increase the spacing and hamper the transfer of excitons between the dyes. The reduced transfer of the excitons from the blue dye to the red dye enables greater control over OLED color avoiding the issue in which small variations in the concentration of the red dye can dramatically change the emission color. Thus, the approach leads to enhanced manufacturing reproducibility. Transient electroluminescence measurements provide detailed insights into the charge carrier and exciton formation and transfer dynamics within the device.