Highly efficient green phosphorescent organic light emitting diodes with simple structure

Efficient Charge Balance of Green Organic Light Emitting Diodes Using Mixed Charge Transporting Materials as the Host

“…1 [8,9] (Ir(ppy) 3 ) as a phosphorescent green emitter. It has double EMLs, which used TCTA and TPBi as host materials.…”

P‐159: Triplet Exciton Confinement in White Phosphorescent Organic Light‐Emitting Diodes with Multi‐Doped Single Emissive Layer

“…triplet-triplet energy transfer occurs from higher triplet energy level to lower triplet energy level in phosphorescent molecules. Therefore, we need to use the host materials with higher triplet energy than those of dopants materials to obtain more energy transfer [4][5]. In this paper, we fabricated simple structure of white PHOLED with single emissive layer such as ITO(1500Å)/ HTL(700Å) / mCP : Firpic-8% : Ir(ppy) 3 -0.5% : Ir(piq) 3 -0.5%(300Å) / TPBi(300Å) / Liq(20Å) / Al(1200Å) using NPB, TCTA and TAPC as HTL which have different triplet energy level respectively and higher efficiency was achieved by triplet exciton's confinement.…”

Highly efficient orange and white phosphorescent organic light-emitting devices with simplified structure

“…However, such a complicated multilayer structure greatly increases the manufacturing cost and prevents their industrialization application. Thus it's a promising strategy to reduce the cost by simplifying the OLEDs structure without compromising the performance for the potential commercial use [15][16][17][18].…”

“…He et al fabricated bi-layer blue OLEDs based on 4,40-bis(9-ethyl-3-carbazovinylene)-1,10-biphenyl as a fluorescent emitter mixed with two charge transport hosts [17]. By using 1,1-bis[(di-4-tolylami-no)phenyl]cyclohexane and 1,3,5-tri(p-pyrid-3-yl-phenyl) benzene as mixed host system, Suh et al reported bi-layer green OLEDs with efficiency of 33.6 cd/A [18].…”