Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Singlet and triplet to doublet energy transfer: improving organic
  light-emitting diodes with radicals   Organic light-emitting diodes (OLEDs) must be engineered to circumvent the
efficiency limit imposed by the 3:1 ratio of triplet to singlet exciton
formation following electron-hole capture. Here we show the spin nature of
luminescent radicals such as TTM-3PCz allows direct energy harvesting from both
singlet and triplet excitons through energy transfer, with subsequent rapid and
efficient light emission from the doublet excitons. This is demonstrated with a
model Thermally-Activated Delayed Fluorescence (TADF) organic semiconductor,
4CzIPN, where reverse intersystem crossing from triplets is characteristically
slow (50% emission by 1 microsecond). The radical:TADF combination shows much
faster emission via the doublet channel (80% emission by 100 ns) than the
comparable TADF-only system, and sustains higher electroluminescent efficiency
with increasing current density than a radical-only device. By unlocking energy
transfer channels between singlet, triplet and doublet excitons, further
technology opportunities are enabled for optoelectronics using organic
radicals.

27
The categories of this paper are: comp-gas
32
The categories of this paper are: atom-ph
0
The categories of this paper are: hep-ph
21
The categories of this paper are: adap-org
24
The categories of this paper are: dg-ga
36
The categories of this paper are: cmp-lg
26
The categories of this paper are: bayes-an
10
The categories of this paper are: q-bio
31
The categories of this paper are: ao-sci
34
The categories of this paper are: chem-ph
30
The categories of this paper are: q-alg
1
The categories of this paper are: cs
28
The categories of this paper are: alg-geom
13
The categories of this paper are: quant-ph
33
The categories of this paper are: plasm-ph
22
The categories of this paper are: chao-dyn