Abstract
We demonstrate flexible red light-emitting diodes based on axial GaPAs/GaP heterostructured nanowires embedded in polydimethylsiloxane membranes with transparent electrodes involving single-walled carbon nanotubes. The GaPAs/GaP axial nanowire arrays were grown by molecular beam epitaxy, encapsulated into a polydimethylsiloxane film, and then released from the growth substrate. The fabricated free-standing membrane of light-emitting diodes with contacts of single-walled carbon nanotube films has the main electroluminescence line at 670 nm. Membrane-based light-emitting diodes (LEDs) were compared with GaPAs/GaP NW array LED devices processed directly on Si growth substrate revealing similar electroluminescence properties. Demonstrated membrane-based red LEDs are opening an avenue for flexible full color inorganic devices.
Highlights
Nowadays, liquid crystal displays (LCDs) are still dominating in screen technologies, since they gradually displaced bulky cathode ray tubes in the 2000s [1,2,3]
The optimal material composition and geometry parameters of the emitters and active region were defined by the calculation of axial p-i-n GaPAs/GaP NW light-emitting diodes (LEDs) heterostructure
At the first step we processed GaPAs/GaP NW array LED devices directly on Si growth substrate in order to test their performance on the rigid substrate and compare it with flexible PDMS/NW membranes released from the substrate
Summary
Liquid crystal displays (LCDs) are still dominating in screen technologies, since they gradually displaced bulky cathode ray tubes in the 2000s [1,2,3]. Inorganic microLEDs fulfill these requirements [17,18,19], and provide an additional transparency functionality, tremendously simplifying the optical configuration [20,21] Another important display application preferable for inorganic materials are wristbands, requiring flexibility, high luminance to guarantee sunlight readability, and a good off-axis performance. III-V microLEDs are the best solution for vehicle displays, i.e., central cluster panels and head-up displays, requiring a very high reliability and sunlight readability for the driver safety In spite of this high demand, III-V microLED technology still requires development to be implemented in practical applications. III-V NW/PDMS membrane LEDs with SWCNT electrodes is a promising technology for highly stretchable, semitransparent, light-weight LEDs of large area for future components of miniLED displays. We studied GaPAs/GaP NWs-based LEDs before array release from the growth Si substrate
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