James Esler

Realizing white phosphorescent 100 lm/W OLED efficacy

OLED display manufacturers are interested in white organic light emitting devices (WOLEDTMs) because these devices, together with color filters, eliminate the need for high resolution shadow masks. Additionally, WOLEDs are well suited for general-purpose illumination, since their power efficacies are approaching fluorescent lamps. A new structure was developed that had the following characteristics that were measured using a spot meter: at 100 cd/m2 normal luminance, EQE = 20%, power efficacy is 34 lm/W, operating voltage = 3.6 V, CIE = (0.44, 0.44) and CRI = 75.

Organic LED Pixel Array on a Dome

We fabricated an array of organic LED (OLED) pixels on a dome of clear polymer foil. The array is first formed on the flat polymer substrate and then is shaped to the dome. During the shaping process, the polymer substrate and the metal interconnect undergo plastic deformation while the OLED pixels remain intact. The OLED pixels have comparable I-V characteristics before and after deformation, but the luminous efficiency was reduced by the deformation, apparently as a consequence of fractures in the aluminum cathode. The demonstration of OLED displays on a spherical surface is an important advance in the fabrication of conformally shaped electronics.

White phosphorescent organic light emitting devices

OLED display manufacturers are interested in white organic light emitting devices (WOLEDs) because these devices, together with color filters, eliminate the need for high resolution shadow masks, and are scalable beyond Gen 4 substrates. Additionally, WOLEDs are well suited for general-purpose illumination, since their power efficacies are approaching fluorescent lamps. A new structure was developed that had the following characteristics that were measured using a 20“ integrating sphere: at 100 cd/m normal luminance, EQE = 35%, power efficacy is 62 lm/W, operating voltage = 4.4 V, CIE = (0.33, 0.43) and CRI = 70.

61.5L: Late-News Paper: Extremely Long Lived White Phosphorescent Organic Light Emitting Device with Minimum Organic Materials

A non-stacked white phosphorescent organic light emitting device with 6 organic materials is demonstrated with extremely long lifetime of LT50 >200,000 hrs from 1,000 nits initial luminance. At 1,000 nits without enhanced outcoupling, EQE = 15.3% (32.4 cd/A), operating voltage = 6.3 V, power efficacy = 16.1 lm/W (30 lm/W with outcoupling enhancement), and CIE (0.45, 0.46).

Plastic deformation of a continuous organic light emitting surface

A continuous organic light emitting diode (OLED) surface was shaped by plastic deformation from flat to dome. The OLED dome, now under an average tensile strain of 2.2%, remained operational. This shapeability is achieved by combining a substrate and a device structure that keep functioning in the plastic deformation regime. The technique of conformally shaping a continuous macroelectronic surface could become useful for the manufacture of arbitrarily shaped solid state light sources and mechanical transducers.