Undoped SrSO
4
nanoplates were synthesized
via
the composite
hydroxide-mediated approach. The products were characterized
by means of X-ray diffractometry, scanning electron microscopy, X-ray
energy-dispersive spectroscopy, X-ray photoelectron spectroscopy,
photoluminescence (PL) spectroscopy, electron spin resonance technique,
afterglow spectroscopy, and thermoluminescence dosimetry. The steady-state
PL spectrum of undoped SrSO
4
nanoplates can be deconvoluted
into two distinct Gaussian bands centered at 2.97 eV (417.2 nm) and
2.56 eV (484.4 nm), respectively. The nature of the defect emissions
is confirmed through the emission-wavelength-dependent PL decays as
well as the excitation-wavelength-dependent PL decays. A cyan-colored
afterglow from undoped SrSO
4
nanoplates can be observed
with naked eyes in the dark, and the afterglow spectrum of the undoped
SrSO
4
nanoplates exhibits a peak at about 492 nm (2.52
eV). The duration of the afterglow is measured to be 16 s. The thermoluminescence
glow curve of the undoped SrSO
4
nanoplates shows a peak
at about 40.1 °C. The trapping parameters are determined with
the peak shape method, the calculated value of the trap depth is 0.918
eV, and the frequency factor is 1.2 × 10
14
s
–1
. Using density functional calculations, the band structures and
densities of states of oxygen-deficient SrSO
4
and strontium-deficient
SrSO
4
are presented. The mechanisms of the cyan-colored
afterglow are discussed for undoped SrSO
4
, and the oxygen
vacancies in SrSO
4
are proposed to be the luminescence
center of the afterglow.
Organic light-emitting diodes (OLEDs) suffer from carrier imbalance under high temperature. We improved their thermal stability by using the space interlayers adjacent to charge transport layers. The current efficiency of...
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