Abstract
Transparent conductive current-spreading layer is important for quantum efficiency and thermal performance of light-emitting diodes (LEDs). The increasing demand for tin-doped indium oxide (ITO) caused the price to greatly increase. Super-aligned carbon nanotubes (SACNTs) and Au-coated SACNTs as current-spreading layer were applied on AlGaInP LEDs. The LEDs with Au-coated SACNTs showed good current spreading effect. The voltage bias at 20 mA dropped about 0.15 V, and the optical power increased about 10% compared with the LEDs without SACNTs.
Highlights
The current-spreading effect is one of the most important factors limiting the external quantum efficiency of lightemitting diodes (LEDs) [1,2]
It can be seen that the Super-aligned carbon nanotubes (SACNTs) were distributed uniformly on the surface in bunches
SACNTs that covered the surface are quasi-aligned and lapped together forming a conducting network, which was essential for carrier transportation
Summary
The current-spreading effect is one of the most important factors limiting the external quantum efficiency of lightemitting diodes (LEDs) [1,2]. Indium tin oxide (ITO) was widely used in case of visible wavelength LEDs as the current-spreading layer owing to its good physical properties of high optical transmittance and low sheet resistance [5]. Ag. Recently, the optical output power of LEDs was first improved by using the combination of graphene film and Ag nanowires as current-spreading layer. The sheet resistance decreases from 500 Ω of bare graphene to about 30 Ω because the silver nanowires bridged the grain boundaries of graphene and increased the conduction channels [13]. Among these three nanomaterials, CNTs have the most mature fabrication technology. The LEDs with Au-coated CNTs showed good current spreading effect
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