Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Harvesting the triplet excitons of quasi-two-dimensional perovskite
  toward highly efficient white light-emitting diodes   Utilization of triplet excitons, which generally emit poorly, is always
fundamental to realize highly efficient organic light-emitting diodes (LEDs).
While triplet harvest and energy transfer via electron exchange between triplet
donor and acceptor are fully understood in doped organic phosphorescence and
delayed fluorescence systems, the utilization and energy transfer of triplet
excitons in quasi-two-dimensional (quasi-2D) perovskite are still ambiguous.
Here, we use an orange-phosphorescence-emitting ultrathin organic layer to
probe triplet behavior in the sky-blue-emitting quasi-2D perovskite. The
delicate white LEDs architecture enables a carefully tailored Dexter-like
energy-transfer mode that largely rescues the triplet excitons in quasi-2D
perovskite. Our white organic-inorganic LEDs achieve maximum forward-viewing
external quantum efficiency of 8.6% and luminance over 15000 cd m-2, exhibiting
a significant efficiency enhancement versus the corresponding sky-blue
perovskite LED (4.6%). The efficient management of energy transfer between
excitons in quasi-2D perovskite and Frenkel excitons in organic layer opens the
door to fully utilizing excitons for white organic-inorganic LEDs.

8
The categories of this paper are: hep-ex
9
The categories of this paper are: nlin
32
The categories of this paper are: atom-ph
15
The categories of this paper are: nucl-ex
14
The categories of this paper are: math-ph
24
The categories of this paper are: dg-ga
16
The categories of this paper are: stat
7
The categories of this paper are: hep-th
30
The categories of this paper are: q-alg
13
The categories of this paper are: quant-ph
4
The categories of this paper are: cond-mat
18
The categories of this paper are: econ
36
The categories of this paper are: cmp-lg
21
The categories of this paper are: adap-org
19
The categories of this paper are: eess
22
The categories of this paper are: chao-dyn