OLED Display

OLED displays can be thin, light-weight and flexible, in addition to having superior image qualities like fast-response, high contrast and wide viewing angle.

Applications

Our core technology and expertise is in the development of solution processed P-OLED materials with high performance. Materials are compatible with large area patterning techniques. Polymer OLED materials can be printed successfully and reproducibly, producing RGB colour points and the high performance required for colour displays.

Spin/BE data
@1000Cd/m
RED GREEN BLUE
Efficiency [cd/A] 31 24 18 85 72 61 12 11 7.5
Colour
(C.I.E. x,y)
x=0.62
y=0.38
x=0.66
y=0.34
x=0.65
y=0.35
x=0.32
y=0.63
x=0.32
y=0.63
x=0.32
y=0.63
x=0.14
y=0.12
x=0.14
y=0.12
x=0.14
y=0.12
T50 lifetime [hrs] 350k 200k 200k 80k 350k >300k >10k
T95 lifetime [hrs] 2000 2400 1000 2600 4400 230 700
Vd [V] 4.2 3.3 3.2 3.9 4.7 5.0 3.7 4.0 4.0

P-OLED device test cell performance summary

Device structure: ITO / HIL / Interlayer / LEP / Low WF cathode

  • Hole injection, interlayer and emitter are all processed from solution
  • R, G, B colour all derived from a simple layer structure
  • Devices fabricated by spin coating processes

device structure of OLED

Features of materials

Sumitomo Chemical have extensive technical expertise in materials chemistry and device physics to realise high performance materials for high end display and lighting applications. We also focus on the optimisation of ink formulations for printing to enable the fabrication of OLED displays and lighting using print processes.

Features of Ink jet printing

Sumitomo Chemical has extensive expertise in print processes to realise the high performance of light-emitting layers formed by printing process.

The picture on the right-hand side below shows film uniformity of organic layers to realize uniform emission across inkjet printed pixels. Required film thickness and uniformity can be achieved by inkjet printing, with the organic layers printed at high speed with single pass printing for RGB, and with a large process window to allow for large scale manufacturing tolerances. Uniform emission inkjet printed P-OLED devices do not suffer from any additional initial degradation mechanism. With carefully selected materials, inks and processes, long T95 lifetimes (greater than 1000 hours) are achieved with inkjet printed devices.

Expertise developed to control IJP film profile can be applied to a variety of other challenges in printed electronics.

picture of a printed pixel

cross section profile of a printed pixel

Analysis chart of influencing factors on film shape formed by ink jet printing

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please feel free to contact us.