White Organic Light-Emitting Diodes with fine chromaticity tuning via ultrathin layer position shifting

Hakim Choukri (1) , Alexis Fischer (1) , Sebastien Forget (1) , Sebastien Chenais (1) , Marie-Claude Castex (1) , Dominique Ades (2) , Alain Siove (2) , Bernard Geffroy (3)

1 LPL - Laboratoire de Physique des Lasers
2 CSPBAT - Chimie, Structures et Propriétés de Biomatériaux et d'Agents Thérapeutiques
3 CEA/LITEN/DSEN - Laboratoire Cellules et Composants

Non-doped white organic light-emitting diodes using an ultrathin yellow-emitting layer of rubrene (5,6,11,12-tetraphenylnaphtacene) inserted on either side of the interface between a hole-transporting NPB (4,4'-bis[N-(1-naphtyl)-N-phenylamino]biphenyl) layer and a blue-emitting DPVBi (4,4'-bis(2,2'-diphenylvinyl)-1,1'-biphenyl) layer are described. Both the thickness and the position of the rubrene layer allow fine chromaticity tuning from deep-blue to pure-yellow via bright-white with CIE coordinates (x= 0.33, y= 0.32), a external quantum efficiency of 1.9%, and a color rendering index of 70. Such a structure also provides an accurate sensing tool to measure the exciton diffusion length in both DPVBi and NPB (8.7 and 4.9 nm respectively).

Mots clés: OLEDs; WOLED

Domaines: Optique [physics.optics]

Hakim Choukri, Alexis Fischer, Sebastien Forget, Sebastien Chenais, Marie-Claude Castex, et al.. White Organic Light-Emitting Diodes with fine chromaticity tuning via ultrathin layer position shifting. Applied Physics Letters, 2006, 89, pp.183513. ⟨10.1063/1.2382730⟩. ⟨hal-00101519⟩