In this work we report exceptional efficacy, lifetime and color stability for all-phosphorescent white stacked organic light-emitting devices (SOLED®s). We report data for all-phosphorescent white SOLED pixels with two emissive units connected in series by a charge generation layer (CGL). At 3,000 cd/m2, efficacy = 54 to 56 lm/W and lifetime to 70% of initial luminance LT70 ≈ 20,000 h, with color rendering index (CRI) = 82 to 83 and chromaticity meeting Energy Star criteria. We further report data for a 15 cm×15 cm white SOLED panel that operates at 3,000 cd/m2 with 48 lm/W efficacy, CRI = 86 and chromaticity meeting Energy Star criteria. The panel has extremely low operating temperature that is only 6.4°C above ambient, and exceptional lifetime of LT70 ≈ 13,000 h when operated at 3,000 cd/m2.
We present a 7.5 cm x 7.5 cm white PHOLEDTM lighting panel that delivers 1,000 cd/m2 with 68 lm/W
efficacy, CRI > 80 and lifetime to LT70 ≈ 15,000 hrs. A simple all-phosphorescent device architecture,
including a highly stable light blue phosphorescent emitter-host system, is used to reduce panel power
consumption, extend operational lifetime and demonstrate exceptional emission color stability with aging.
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.
Phosphorescent organic light emitting device (PHOLEDTM) technology has demonstrated record high efficiencies and
long operational stability. Here we report on the introduction of an additional charge transporting dopant into the device
emissive layer to further improve the luminous efficiency and device lifetime. The performance enhancement is
attributed to the separation of polarons and excitons in the device emissive layer, which results in reduced triplet-triplet
and triplet-polaron interactions as well as minimizing self quenching and reabsorption. Specifically we report a 50%
improvement in the luminous efficiency of a red PHOLED and a 3 fold improvement of the device lifetime due to the
use of dual doping. A dual doped sRGB red device with 28 cd/A and the lifetime over 300,000h at 1,000 nits is
In this paper, two approaches are demonstrated to narrow phosphorescent OLED (PHOLED) emission lineshapes to
increase color saturation while keeping device high efficiency performance, which is critical for large area flat panel
displays. One approach uses bottom-emissive microcavity structure in green and blue devices to achieve 22 nm full
width half maximum (FWHM) emissions. The other approach is to reduce the natural width of the emission as
exemplifying in a red device. A new NTSC red with 64 nm FWHM emission is reported. In a standard device, it has a
luminous efficiency of 18.3 cd/A at 10 mA/cm2.
A 6"x6" white lighting panel consisting of red, green and blue colored stripes of OLEDs emits >100 lm of optical power and has a maximum energy efficacy of 30 lm/W. Each colored stripe contains 7 serially connected OLEDs having an area of 1.37 cm2, and there are 4 stripes per color, so there is a total of 84 devices. The external quantum efficiency of the red and blue OLEDs exceeds 20% and the blue OLED efficiency exceeds 5% when operated above 100 nits. Such high quantum efficiencies are achieved with an OLED architecture consisting of electrophosphorescent dopants, and at least four organic thin films layers: a hole injection layer, a hole transport layer, an emissive layer, a blocking layer, and an electron transport layer. The color coordinates of the panel can be varied between the constituent red, green, and blue color component coordinates of (0.14, 0.17), (0.31, 0.64), and (0.62, 0.38), respectively, by adjusting the intensity of each primary colors. Panel power efficiencies were measured at correlated color temperatures between 2,900 K and 5,700K, and the color rendering index was >80 in all cases because of the broad spectral output of the combined colors.
As organic light emitting device (OLED) technology is building up momentum in the commercial marketplace,
phosphorescent OLEDs (PHOLEDsTM) are proving themselves to be an ideal display medium for a wide range of
product applications: from small mobile displays to large area TVs. As part of this work we continue to advance
PHOLED technology by new materials design and device architectures. For example a green PHOLED with 4.3 V,
70 cd/A, 50 lm/W and > 10,000 hours lifetime at 1,000 cd/m2 is reported. PHOLEDs enable very low power
consumption displays with low display operating temperatures, and can be deposited by a range of different
deposition techniques. Along with state-of-the-art device performance we report results on the ruggedness of
PHOLED materials in high volume manufacturing environments.
Two blue-shifted iridium phenyl-pyridine dopants are compared in identical device structures. While the dopants have very similar optical behavior, it is found that the device efficiencies are very different and dependent on the host material. Upon comparison of molecular energy levels it is proposed that the electronic properties of the dopant influence the device efficiency through an electron trapping mechanism. It is believed that the relative energetics between the host and dopant play an integral role in the operation of the device.