Universal Display Corporation

A first demonstration of phosphorescence-doped OVPD-OLEDs with identical VTE performance was achieved at Universal Display Corporation (UDC) and at TU Braunschweig [48] by use of PtOEP. The electroluminescence spectrum, with emission at 651.1 nm, and the structure of the device are shown in Fig. 9.10. The external quantum efficiency of this OVPD device reached 3.88% at 3.7 V forward potential (Fig. 9.11) this is identical to the external quantum efficiency of the nearly identical VTE device reported by Baldo and Forrest [49]. 

In 2005 Universal Display Corporation published OVPD results of an advanced... 

OVPD technology has been exclusively licensed to AIXTRON from Universal Display Corporation, Ewing, NJ, USA, for equipment manufacture. OVPD technology is based on an invention by Professor Stephen R. Forrest et al. at Princeton University, USA, which was exclusively licensed to UDC. AIXTRON and UDC have jointly developed and validated OVPD pre-production equipment. OVPD is a registered trademark. 

Although there have been several examples of flexible OLED displays on plastics, including passive-matrix OLED displays on poly(ethylene terephthalate) (PET) substrates from Pioneer and Universal Display Corporation [26, 27], and a-Si H TFT-driven monochrome active-matrix OLED displays on poly(ethylene naphthalate) (PEN) from Honeywell [28], there have been no demonstrations of organic TFT-... 

Nakayama et al. reported highly efficient and stable single-stack white phosphorescent OLEDs based on blue triplet emitter KMBD-342 described in Section 14.4.2.3. Yellow-green (YD-85) and red (RD-61) dopants used in the device were provided by Universal Display Corporation. The device layer structure was as follows Light outcoupling film ITO HIL HTL green EML red EML I blue EML HBL n-doped ETL A1. At 1000cd/m the performance... 

Universal Display Corporation. 2008. Features and performance of PHOLEDs. WWW.universaldisplay.com/default.asp contentlD=604 (accessed August 20, 2008). 

An important breakthrough came with the discovery that with the addition of phosphorescent dopant emitters such as Ft, Ir, Os, etc., the energy could be transferred from the triplet states to the dopant molecules which could decay radiatively. As a result, the internal quantum efficiency (the number of photons generated inside the device per electron-hole pair injected) of these phosphorescent organic light-emitting diodes (PHO-LEDs) (PHOLED is a trademark of the Universal Display Corporation, Ewing, New Jersey) can approach a quantum efficiency 100% at a luminescence of 100 cd/sr. 

---