Tuning of emission color for blue dendrimer blend light-emitting diodes | Zendy

Jonathan P. J. Markham | Zendy; Ebinazar B. Namdas | Zendy; Thomas D. Anthopoulos | Zendy; Ifor D. W. Samuel | Zendy; Gary J. Richards | Zendy; Paul L. Burn | Zendy

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Tuning of emission color for blue dendrimer blend light-emitting diodes

Author(s) -

Jonathan P. J. Markham,

Ebinazar B. Namdas,

Thomas D. Anthopoulos,

Ifor D. W. Samuel,

Gary J. Richards,

Paul L. Burn

Publication year - 2004

Publication title -

applied physics letters

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 1.182

H-Index - 442

eISSN - 1077-3118

pISSN - 0003-6951

DOI - 10.1063/1.1784521

Subject(s) - dendrimer , optoelectronics , diode , materials science , light emitting diode , blue light , oled , nanotechnology , polymer chemistry , layer (electronics)

We demonstrate efficient tunable blue electroluminescence from blends of two solution-processible light-emitting dendrimers. These materials can be blended to form optical quality thin films with no phase-separation effects, irrespective of the blend ratio. External quantum efficiencies of 1% have been measured for the blend systems and the emission color can be tuned from deep blue (emission peak 401nm) to blue green (477nm) by blend composition. A power efficiency of 1.5lm∕W (at 200Cd∕m2 and 5.4V) is measured for a single layer, first-generation blue-green fluorene-thiophene dendrimer. These results show that by choice of a dendrimer structure with common branching units and surface groups, dissimilar cores can be blended with excellent miscibility. This provides a simple way of tuning the color of organic light-emitting diodes.

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