| Article ID | Journal | Published Year | Pages | File Type |
|---|---|---|---|---|
| 1265442 | Organic Electronics | 2011 | 5 Pages |
We report top-emitting white organic light-emitting diodes (WOLEDs) by thermally evaporating non-doped (4-(4-(1,2,2-triphenylvinyl)phenyl)-7-(5-(4-(1,2,2-triphenylvinyl)phenyl)thiophen-2yl)benzo[c][1,2,5]thiadiazole) (BTPETTD) as a color conversion cap layer on top-emitting blue OLEDs. With a 240 nm cap layer, 74.5% of the blue photon energy are absorbed and converted to red emission with a conversion efficiency of 40%. By mixing the unabsorbed blue emission and red emission, the resulting top-emitting WOLEDs exhibit a broad band spectra with CIE coordinates of (0.34, 0.35), high color stability over a wide range of driving voltages, and peak efficiency of 17.7 cd/A and 8.7 lm/W.
Graphical abstractFigure optionsDownload full-size imageDownload as PowerPoint slideResearch highlights► Top-emitting WOLEDs capped with a color conversion layer have been demonstrated. ► The top-emitting WOLEDs exhibit ultra high color stability over a wide range of driving voltages. ► It is easy to fabricate such top-emitting WOLEDs. ► With 240 nm color conversion layer, the top-emitting WOLEDs exhibit a CIE coordinates of (0.34,0.35), peak efficiency of 17.7 cd/A and 8.7 lm/W.
