High‐efficiency phosphorescent OLED technology

Abstract

Abstract— Universal Display Corp. (UDC), together with its academic partners at Princeton University and the University of Southern California, are developing high‐efficiency electrophosphorescent small‐molecule OLED devices, based on triplet emission. These device systems show good lifetimes, and are well suited for the commercialization of low‐power‐consumption full‐color active‐matrix OLED displays. In this paper we also show how these phosphorescent devices may be driven by low‐cost amorphous‐silicon backplanes, and discuss benefits that could be gained by employing bistable OLED pixels.

Recent advances in organic light-emitting diodes: toward smart lighting and displays

“…65 In terms of device operation stability, the reported T95 (operational duration of the device till the luminance is decayed to 95% of the initial luminance, which is 1000 cd m À2 ) of green and red PhOLEDs is longer than 10 000 hours. 69 Nevertheless, long-lived blue PhOLEDs have not been realized since their first demonstration in 2001. 70 To the best of our knowledge, the champion T80 of sky-blue PhOLEDs with a single emitting layer is only about 334 h with CIE coordinates of (0.16, 0.30).…”

“…The reported T95 of the red and green devices has already exceeded 10 000 hours at 1000 cd m À2 . 69 TADF offers many possibilities for stable blue OLEDs, but this technology is not mature enough to provide answers yet. It remains an urgent task to prevent aging of the devices.…”

The short device lifetimes of blue PhOLEDs: insights into the photostability of blue Ir(iii) complexes

“… 2 Besides high efficiencies, it is essential that the devices possess long-lived operational stability. 3 In contrast to red or green PhOLEDs, the fabrication of a long-lasting blue PhOLED has not been achieved yet, which has consequently limited the large-scale commercialization of PhOLEDs. For both lighting and display applications, operational lifetimes of T 95 > 10000 h are mandatory 3 (where T X is the time under constant current operation in which the luminance decreases to X % of its initial value).…”

“… 3 In contrast to red or green PhOLEDs, the fabrication of a long-lasting blue PhOLED has not been achieved yet, which has consequently limited the large-scale commercialization of PhOLEDs. For both lighting and display applications, operational lifetimes of T 95 > 10000 h are mandatory 3 (where T X is the time under constant current operation in which the luminance decreases to X % of its initial value). To illustrate the size of the gap to be bridged, state-of-the-art blue 4 , 5 and greenish-blue 6 , 7 PhOLEDs are characterized by T 80 of <10 h and <160 h, respectively, values clearly insufficient for practical applications.…”

Development of passive matrix full color organic light emitting diode display

“…In Fig. 3, we compare the current efficiency of our fluorescent green OLED with a green phosphorescent OLED [7] (which may not be a state of art device). The intent in this paper is not to compare the efficiency values, but the nature of the two curves.…”