Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Towards electrically driven organic semiconductor laser with
  field-effective transistor structure   Laser is one of the most important discoveries in the 20th century, and
inorganic semiconductor lasers (ISCL) are most frequently used in many
applications nowadays. Organic semiconductor lasers (OSCL) have many attractive
features when they compared to ISCLs, such as flexibility, human friendliness,
feasible and inexpensive production process, light weight, and multicolor
emission. However, electrically driven OSCLs (el-OSCL) have not yet been
realized, although they are possible in an optically driven mode. Here, we
report that an el-OSCL can be realized in field-effect transistor (FET)
structure. The FET el-OSCL with distributed feedback (DFB) construction is made
using a BP3T single crystal as a lasing medium electrostatically laminated on a
silicon substrate modified with periodically patterned polystyrene. An emergent
sharp-linewidth emission spectrum to the resolution limit of a detector and a
non-linear increase in intensity above the threshold current density of ca. 1
kA cm-2 was observed, being indicative of lasing. Discussions on the possible
realization of lasing in el-OSCLs can be made from the comparison between
optical and electrical-driven mode.

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The categories of this paper are: astro-ph
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The categories of this paper are: bayes-an
17
The categories of this paper are: q-fin
18
The categories of this paper are: econ
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The categories of this paper are: alg-geom
9
The categories of this paper are: nlin
25
The categories of this paper are: patt-sol
2
The categories of this paper are: math
1
The categories of this paper are: cs
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The categories of this paper are: eess
16
The categories of this paper are: stat
23
The categories of this paper are: solv-int
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The categories of this paper are: hep-ex
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The categories of this paper are: mtrl-th
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The categories of this paper are: acc-phys
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The categories of this paper are: comp-gas