Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Homogeneously bright, flexible and foldable lighting devices with
  functionalised graphene electrodes   Alternating current electroluminescent technology allows the fabrication of
large area, flat and flexible lights. Presently the maximum size of a
continuous panel is limited by the high resistivity of available transparent
electrode materials causing a visible gradient of brightness. Here, we
demonstrate that the use of the best known transparent conductor
FeCl$_{3}$-intercalated few-layer graphene boosts the brightness of
electroluminescent devices by 49$\%$ compared to pristine graphene. Intensity
gradients observed for high aspect ratio devices are undetectable when using
these highly conductive electrodes. Flat lights on polymer substrates are found
to be resilient to repeated and flexural strains.

34
The categories of this paper are: chem-ph
9
The categories of this paper are: nlin
24
The categories of this paper are: dg-ga
35
The categories of this paper are: mtrl-th
33
The categories of this paper are: plasm-ph
36
The categories of this paper are: cmp-lg
19
The categories of this paper are: eess
1
The categories of this paper are: cs
23
The categories of this paper are: solv-int
6
The categories of this paper are: astro-ph
0
The categories of this paper are: hep-ph
37
The categories of this paper are: supr-con
12
The categories of this paper are: nucl-th
14
The categories of this paper are: math-ph
5
The categories of this paper are: gr-qc
31
The categories of this paper are: ao-sci