Stacked white organic light emitting devices consisting of separate red, green, and blue elements

Abstract

We demonstrate a white organic light-emitting device where individual red, green, and blue ͑R, G, and B͒ phosphorescent organic light-emitting devices are vertically stacked and electrically interconnected by a compound MoO 3 / Li-doped charge generation layer. For the order of B, G, and R cells positioned relative to the indium tin oxide anode, the device yields a peak total external quantum efficiency ͑EQE͒ and power efficiency ͑PE͒ of ext = ͑36Ϯ 2͒% at a current density of J =82 A / cm 2 and p =21Ϯ 1 lm/ W at J =17 A / cm 2 , respectively. The EQE and PE of the device roll off to ͑32Ϯ 2͒% and 13Ϯ 1 lm/ W at 1000 cd/ m 2 , corresponding to J =2 mA/ cm 2. At this luminance, the device shows Commission Internationale de L'Eclairage chromaticity coordinates of ͑0.45, 0.36͒ and a color rendering index of 63.

Analysis of metal-oxide-based charge generation layers used in stacked organic light-emitting diodes

“…7 The device yielded a peak total external quantum efficiency ͑EQE͒ and power efficiency ͑PE͒ of ext = ͑36Ϯ 2͒% and p = ͑21Ϯ 1͒ lm/ W at current densities of J =82 A / cm 2 and J =17 A / cm 2 , respectively. Both the high efficiency and white balance achieved in this SOLED indicate that efficient charge generation and injection can be obtained using MoO 3 , 8 and the results may be generalized to other compound CGLs such as Mg:tris-͑8-hydroxyquinoline͒-aluminum͑Alq 3 ͒ / WO 3 and Mg: Alq 3 / V 2 O 5 .…”

Highly Efficient Hybrid White Tandem Organic Light‐Emitting Diodes with MoO3 Layer

“…The energies of HOMO and LUMO levels were obtained for NPB and BCzVBi from Kim et al, [35] for ADN and DPyPA from Sun et al, [36] for CBP from Qi et al, [37] for (fbi) 2 Ir(acac) from Wang et al, [23] for SBFK from Chinet et al [41] and for MoO 3 from Liu et al [16] while the work function was obtained for ITO and Al from Li et al [38] and Li et al, [39] respectively. As seen from this diagram, the LUMO levels between EML and ETL are close to each other in both EL1 and EL2.…”

High efficiency double-layer white polymer light-emitting diode

“…Among them, red, blue and green light at the same time to realize white light by using stacked structure [12], microcavity structure [13] and quantum well structure [14].…”