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PIN OLEDs — Improved structures and materials to enhance device lifetime
Author(s) -
Birnstock Jan,
Canzler Tobias,
Hofmann Michael,
Lux Andrea,
Murano Sven,
Wellmann Philipp,
Werner Ansgar
Publication year - 2008
Publication title -
journal of the society for information display
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.578
H-Index - 52
eISSN - 1938-3657
pISSN - 1071-0922
DOI - 10.1889/1.2841854
Subject(s) - oled , materials science , brightness , optoelectronics , luminance , diode , doping , voltage , electrical efficiency , power (physics) , computer science , optics , electrical engineering , composite material , physics , artificial intelligence , layer (electronics) , quantum mechanics , engineering
— Currently, three issues are identified that decide upon the commercial success of organic light‐emitting diodes (OLEDs), both in display and lighting applications: power efficiency, lifetime, and price competitiveness. PIN OLEDs are widely seen as the preferred way to maximize power efficiency. Here, it is reported that this concept also delivers the world longest lifetimes. For a highly efficient deep‐red PIN OLED, a half‐lifetime of 25,000 hours for a starting brightness of 10,000 cd/m 2 and a minimal voltage increase over lifetime is reported. This value corresponds to more than 1 × 10 6 hours at 1000 cd/m 2 using an exponent of n = 1.7, which was measured by driving the OLEDs at different starting luminances. Because there is no initial luminance drop, these PIN OLEDs also exhibit a very high 80% lifetime (>300,000 hours at 1000 cd/m 2 ). New record lifetime values for blue and green will be reported as well. Additionally, further topics that have impact on the production yield and cost such as the newly developed air‐stable organic n ‐doping material NDN‐26 and top‐emitting structures will be discussed.