Porous CaTiO3 solid submicrospheres, SrTiO3 and BaTiO3 hollow submicrospheres, which had larger surface area (40.21 to 228.18 m2·g-1) and uniform particle size, were synthesized by self-template assisted hydrothermal method with...
All-inorganic perovskite quantum dots (PQDs, CsPbX3,
X = Cl, Br, and I) show outstanding application prospects in the field
of photoelectric devices. In recent years, the development of PQDs
has greatly improved their stability to water, oxygen, and light.
However, thermal quenching of PQDs greatly limits their practical
application. Herein, we embed PQDs into ATiO3 (A = Ca,
Ba, and Sr) of three different mesoporous spherical structures to
explore the effect on thermal quenching of PQDs. Because of the unique
mesoporous hollow microsphere structure and low thermal conductivity
of SrTiO3, it can effectively block the heat transfer and
improve the thermal quenching of PQDs. The photoluminescence (PL)
intensity of CsPbBr3@SrTiO3 composites is 72.6%
of the initial intensity after heating to 120 °C. Moreover, the
PL intensity of CsPbBr3@SrTiO3 composites remains
about 80% of the initial value even when stored in air for 20 days
or irradiated by 365 nm UV light for 48 h. A neutral white light-emitting
diode is assembled by a blue chip, CsPbBr3@SrTiO3 composites, and red phosphor of K2SiF6:Mn4+, which has a color temperature of 5389 K and a color gamut
covered 133% of National Television Standards Committee (NTSC).
All-inorganic perovskite quantum dots (PQDs) have great
application
prospects in many fields because of their excellent photoelectric
properties. However, their instability in water, oxygen, light, and
heat leads to photoluminescence quenching, and the method of colloidal
synthesis makes it difficult to achieve a large-scale synthesis, limiting
practical applications. Herein, we synthesize CsPbX3@SiO2 with excellent optical performance and stability by closing
the mesopores of SiO2 at high temperature in air atmosphere.
Moreover, the photoluminescence quantum yield (PLQY) of CsPbBr3@SiO2 is as high as 80.6%, and the full width at
half-maximum (fwhm) is 23 nm. In addition, CsPbX3@SiO2 shows excellent stability as a result of the melt closed
mesoporous SiO2, and the relative electroluminescence intensity
of composites remains 125.6% of the original after operating at 85%
humidity and 85 °C for 360 h. Neutral white light was obtained
by assembling blue LEDs with green and red composite materials, whose
color temperature (CCT) was 4995 K and color gamut covered 134.6%
of NTSC. Impressively, the preparation process of mesoporous SiO2 and CsPbX3@SiO2 is simple and low-cost.
Furthermore, it can enable large-scale preparation and shows great
potential in practical applications.
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