Localized current injection and submicron organic light-emitting device on a pyramidal atomic force microscopy tip.

Area of Science:

• Materials Science
• Nanotechnology
• Optoelectronics

Background:

• Atomic force microscopy (AFM) probes are essential tools for nanoscale imaging.
• Developing miniaturized light sources for integrated AFM applications is challenging.

Purpose of the Study:

• To fabricate a functional organic light-emitting device (OLED) directly onto an AFM probe tip.
• To investigate the light emission characteristics from a nonplanar, high-curvature surface.

Main Methods:

• Utilized a lithography-free vacuum thermal evaporation (VTE) process to deposit organic materials.
• Leveraged the line-of-sight deposition of VTE for controlled thickness variation on the pyramidal AFM tip.
• Characterized the device for localized current injection and photon emission.

Main Results:

• Successfully fabricated an OLED on a commercial AFM probe.
• Achieved localized current injection and photon emission from a region less than one micrometer across at the AFM tip.
• Demonstrated controlled thickness variation due to VTE on the nonplanar substrate.

Conclusions:

• The VTE process enables the creation of highly localized nanoscale light sources on AFM probes.
• This integrated device offers potential for probe-based optical microscopy, nanoscale sensing, and chemical detection.