White stacked OLED with 38 lm/W and 100,000-hour lifetime at 1000 cd/m2 for display and lighting applications

• Published in: Journal of the Society for Information Display Vol. 17; no. 2; pp. 159 - 165
• Main Authors: He, Gufeng, Rothe, Carsten, Murano, Sven, Werner, Ansgar, Zeika, Olaf, Birnstock, Jan
• Format: Journal Article
• Language: English
• Published: Oxford, UK Blackwell Publishing Ltd 01-02-2009
• Subjects: doping; lifetime; light-emitting diode; p-n junction; PIN; power efficiency; stacked
• ISSN: 1071-0922; 1938-3657
• DOI: 10.1889/JSID17.2.159

— The three critical parameters in determining the commercial success of organic light‐emitting diodes (OLEDs), both in display and lighting applications, are power efficiency, lifetime, and price competitiveness. PIN technology is widely considered as the preferred way to maximize power efficiency and lifetime. Here, a high‐efficiency and long‐lifetime white‐light‐emitting diode, which has been realized by stacking a blue‐fluorescent emission unit together with green‐ and red‐phosphorescent emission units, is reported. Proprietary materials have been used in transport layers of each emission unit, which significantly improves the power efficiency and stability. The power efficiency at 1000 cd/m2 is 38 lm/W with CIE color coordinates of (0.43, 0.44) and a color‐rendering index (CRI) of 90. An extrapolated lifetime at an initial luminance of 1000 cd/m2 is above 100,000 hours, which fulfils the specifications for most applications. The emission color can also be easily tuned towards the equal‐energy white for display applications by selecting emitting materials and varying the transport‐layer cavities.