Highly efficient and bright organic light-emitting diodes have been realized by inserting a thin insulating lithium fluoride (LiF) layer in the tris-(8-hydroxyquinoline) aluminum (Alq3) with conventional organic layers. By comparing the performances of newly devised devices as a function of the position of the LiF in the Alq3 layer, the authors propose the optimal position of the LiF in the Alq3 layer. Experimental results show that the efficiency and brightness of the newly devised device with LiF in the Alq3 layer were seven times higher than that without LiF in the Alq3 layer.
- Carrier injection
- Lithium fluoride (LiF)
- Organic light-emitting diodes (OLEDs)
- Recombination efficiency
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Electrical and Electronic Engineering