Over the past few decades, I-III-VI quantum dots (QDs) have attracted considerable attention due to their large Stokes shifts, good eco-friendliness, and wide tunable emissions. In this work, a facile microwave-assisted aqueous route using glutathione (GSH) and citric acid (CA) as dual stabilizers is introduced to synthesize AgInGaS/ZnS (AIGS/ZnS) core/shell QDs. An exceptional photoluminescence quantum yield (PL QY) as high as 79% is successfully achieved, boosting the best performance of water-dispersible AIGS QDs. By varying the Ag/Ga ratio, the PL peak wavelength can be tuned from 547 to 616 nm, and luminescent hydrogel films with different colors are obtained by embedding AIGS/ZnS QDs in polyacrylamide/poly-vinyl alcohol (PAAm/PVA) hydrogels. The white light-emitting diode (WLED) with a high color rendering index (CRI) of 92.1 ( R 9 =92.0) and a correlated color temperature (CCT) of 3022 K is fabricated using QDs-PAAm/PVA hydrogel films in combination with a blue InGaN LED chip, indicating that the as-prepared QDs are competitive color-conversion materials for WLEDs.
Lei Han,Xi Yuan,Zitong Wang,Jie Hua,Jin Wang,Jinju Zheng,Jialong Zhao
Mn-doped two-dimensional lead halide perovskites nanoplatelets (NPLs) possess promising application in solid state lighting. The Mn:L 2 [CsPbBr 3 ]PbBr 4 NPLs with corporation of Cd 2+ were prepared via a hot injection method. The photoluminescence (PL) properties the NPLs with different Mn/Pb/Cd molar ratio from 0.5/1/0 to 5/1/3 were investigated by steady-state and time-resolved PL spectroscopy, indicating that the doping efficiency of Mn 2+ can be boosted by adding Cd 2+ to the NPLs. After thermal annealing, the PL quantum yield of Mn 2+ ions reached up to 75%, which is Cd 2+ content dependent. The temperature-dependent PL spectra demonstrated that the thermal activation energies of the NPLs could be increased by incorporating Cd 2+ , meaning that the nonradiative defect/trap states were effectively suppressed. These experimental results suggested the PL properties of Mn:L 2 [CsPbBr 3 ]PbBr 4 NPLs were optimized by adding Cd 2+ ions.
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