Accession Number:

ADA618352

Title:

Exploring the Potential of Nucleic Acid Bases in Organic Light Emitting Diodes

Descriptive Note:

Journal article

Corporate Author:

AIR FORCE RESEARCH LAB WRIGHT-PATTERSON AFB OH

Report Date:

2014-01-01

Pagination or Media Count:

12.0

Abstract:

Naturally occurring biomolecules have increasingly found applications in organic electronics as a low cost, performance-enhancing, environmentally safe alternative. Previous devices, which incorporated DNA in organic light emitting diodes OLEDs, resulted in significant improvements in performance. In this work, nucleobases NBs, constituents of DNA and RNA polymers, are investigated for integration into OLEDs. NB small molecules form excellent thin films by low-temperature evaporation, enabling seamless integration into vacuum deposited OLED fabrication. Thin film properties of adenine A, guanine G, cytosine C, thymine T, and uracil U are investigated. Next, their incorporation as electron-blocking EBL and hole-blocking layers HBL in phosphorescent OLEDs is explored. NBs affect OLED performance through charge transport control, following their electron affinity trend G A C T U . G and A have lower electron affinity 1.8 2.2 eV, blocking electrons but allowing hole transport. C , T , and U have higher electron affinities 2.6 3.0 eV, transporting electrons and blocking hole transport. A-EBL-based OLEDs achieve current and external quantum efficiencies of 52 cd A 1 and 14.3, a ca. 50 performance increase over the baseline device with conventional EBL. The combination of enhanced performance, wide diversity of material properties, simplicity of use, and reduced cost indicate the promise of nucleobases for future OLED development.

Subject Categories:

  • Biochemistry
  • Organic Chemistry
  • Electrooptical and Optoelectronic Devices

Distribution Statement:

APPROVED FOR PUBLIC RELEASE