Abstract

White light is emitted by an organic light-emitting diode by inserting two blend layers of m-$\mathrm{MTDATA}:\mathrm{Al}{\left(\mathrm{DBM}\right)}_3$ and TPD:Bphen between an m-MTDATA hole-transporting layer and a Bphen electron-trans porting layer, where m-MTDATA, TPD, $\mathrm{Al}{\left(\mathrm{DBM}\right)}_3$, and Bphen are $4,4^{\prime },4^{″}$-tris[methylpheny(phenyl)amino]- triphenylamine, $\mathit{N}\mathit{,}{\mathit{N}}^{\mathit{\prime }}$-bis(3-methylphenyl)-$\mathit{N}\mathit{,}{\mathit{N}}^{\mathit{\prime }}$-diphenylbenzidine, tris(dibenzoyl methane)-aluminum, and 4,7-diphenyl-1,10-phenanthroline molecules, respectively. The white-light spectrum consists of four broad bands that arise from blue-emitting TPD/Bphen, green-emitting m-MTDATA/Bphen, orange-emitting $\mathrm{TPD}∕\mathrm{Al}{\left(\mathrm{DBM}\right)}_3$, and red-emitting m-$\mathrm{MTDATA}∕\mathrm{Al}{\left(\mathrm{DBM}\right)}_3$ exciplexes, respectively, and strongly overlap at 400–760 nm. Any monomer emission is not generated. A high-color rendering index of 94.1, Commission Internationale de l’Eclairage-${1931}_{\mathrm{x},\mathrm{y}}$ coordinates of (0.33, 0.35), and correlated color temperature of 5477 K were obtained at 10 V. Discussion is given for the formation mechanism of the four exciplexes.

© 2009 Optical Society of America

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