White Light Emission from a Zero-Dimensional Lead
Chloride Hybrid Material
Posted on 2020-04-09 - 11:37
Organic–inorganic
hybrid (OIH) materials have emerged as
a high-performance class of light emitters, which can be used as phosphors
for optically pumped white-light-emitting diodes (WLEDs). Here, we
report a new example of broadband white light (WL) emission from zero-dimensional
lead chloride-based OIH material, namely, (TAE)2[Pb2Cl10](Cl)2 (TAE = tris(2aminoethyl)ammonium
(C6N4H22)). Single crystals of this
compound and its corresponding ammonium salt TAE·HCl have been
synthesized by a slow solvent evaporation method at room temperature
and were characterized by X-ray diffraction, optical absorption, and
photoluminescence measurements. The crystal structure shows an isolated
lead chloride edge sharing bioctahedra [Pb2Cl10]6– interacting with two [TAE]4+ cations
and two Cl– chlorine ions through multiple hydrogen
bonds in a triclinic unit cell, which confers to this system its 0D
character. Upon UV irradiation at 3.81 eV, (TAE)2[Pb2Cl10](Cl)2 shows a very broadband WL
emission resulting from the overlapping of two peaks located at 2.07
and 2.83 eV, attributed to photoinduced free excitons confined in
Pb2Cl10 inorganic bioctahedra and the organic
cations, respectively. When excited with a 4.66 eV laser, the full
width at half-maximum of WL band luminescence reaches the unprecedented
value of 1.25 eV (247 nm) and exhibits the highest CRI value with
96 and chromaticity coordinates closer to the reference white light.
This was mainly attributed to light emission originating from some
self-trapped excitonic states caused by a structurally highly distorted
inorganic subnetwork. The present results enrich the restricted family
of hybrid perovskite WL emitters and highlight the importance of the
0D OIH materials for solid-state lighting applications.
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Elleuch, S.; Lusson, A.; Pillet, S.; Boukheddaden, K.; Abid, Y. (2020). White Light Emission from a Zero-Dimensional Lead
Chloride Hybrid Material. ACS Publications. Collection. https://doi.org/10.1021/acsphotonics.9b01817
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AUTHORS (5)
SE
S. Elleuch
AL
A. Lusson
SP
S. Pillet
KB
K. Boukheddaden
YA
Y. Abid
KEYWORDS
chloride edge3.81 eVbroadband WL emissionTAEself-trapped excitonic states0 D OIH materialstriclinic unit celllight emittersX-ray diffractionUV irradiationchloride-based OIH materiallight emissionlighting applicationsevaporation methodCRI valueperovskite WL emittersWhite Light EmissionWL band luminescence4.66 eV lasercrystal structure2.83 eVWLEDroom temperature0 D characterwhite-light-emitting diodeshydrogen bondschromaticity coordinatesphotoluminescence measurementsPb 2 Cl 10