In Situ Crystallization Synthesis of CsPbBr₃ Perovskite Quantum Dot-Embedded Glasses with Improved Stability for Solid-State Lighting and Random Upconverted Lasing

Abstract

All-inorganic cesium lead bromide CsPbBr perovskite quantum dots (QDs) are emerging as potential candidates for their applications in optoelectronic devices but they suffer from poor long-term stability due to their high sensitivity to UV irradiation, heat, and especially to moisture. Although great advances in improving stability of perovskite QDs have been achieved by surface modification or encapsulation in polymer and silica, they are not sufficiently refrained from external environment due to nondense structures of these protective layers. In this work, in situ nanocrystallization strategy is developed to directly grow CsPbBr QDs among a specially designed TeO-based glass matrix. As a result, QD-embedded glass shows typical bright green emission assigned to exciton recombination radiation and significant improvement of photon/thermal stability and water resistance due to the effective protecting role of dense structural glass. Particularly, ∼90% of emission intensity is even remained after immersing QD-embedded glass in water up to 120 h, enabling them to find promising applications in white-light-emitting device with superior color stability and low-threshold random upconverted laser under ambient air condition.

Highly Efficient and Water‐Stable Lead Halide Perovskite Quantum Dots Using Superhydrophobic Aerogel Inorganic Matrix for White Light‐Emitting Diodes

“…PL decay fitting parameters: fast decay time t 1 , slow decay time t 2 , t 1 proportion a 1 , t 2 proportion a 2 , and average decay time t avg , and PLQY of different PQD samples corresponding to Figure 4a-e; particularly, the PL decay curves of the AeroPQDs were fitted using monoexponential function. [16][17][18][19][20]26] Please note that in some previous studies, the reliability of PQDs was evaluated by placing them on water instead of soaking them. Accordingly, the mass ratio of 5:1 was selected for all subsequent tests.…”

“…[4] Particularly, PQDs suffer from low chemical and optical stabilities, resulting in their fast degradation under exposure to moisture, heat, and light irradiance. [13,14] Current research efforts therefore aim at enhancing the stability of PQDs by covering them in inorganic materials, including CdS, [15] zeolite, [16,17] glass, [18,19] CaF 2 , [20] Al 2 O 3 , [21][22][23] SiO 2 , [24][25][26][27][28][29] and TiO 2 . [13,14] Current research efforts therefore aim at enhancing the stability of PQDs by covering them in inorganic materials, including CdS, [15] zeolite, [16,17] glass, [18,19] CaF 2 , [20] Al 2 O 3 , [21][22][23] SiO 2 , [24][25][26][27][28][29] and TiO 2 .…”

“…While protected PQDs with high chemical, thermal, and irradiation stabilities have been obtained, [28] the water stability of PQDs prepared with these inorganic shells still indicate a lot of room for improvement. [18,19,[31][32][33][34][35][36][37][38][39] The hydrophobic surface and dense polymer chains of the matrix can effectively protect the PQDs from the external environment, considerably enhancing their [18,19,[31][32][33][34][35][36][37][38][39] The hydrophobic surface and dense polymer chains of the matrix can effectively protect the PQDs from the external environment, considerably enhancing their…”

Synthesis and optical properties of novel mixed‐metal cation CsPb1−xTixBr3‐based perovskite glasses for W‐LED

“…Liu et al first successfully precipitated QDs in phosphate glass emitting effective fluorescence under the excitation of ultraviolet light or blue light, which provides a new opportunity for QDs to have good stability . Chen et al developed a new tactic for crystallizing CsPbBr 3 QDs in situ in glass, which made QDs more stable . Therefore, all inorganic CsPbX 3 HP glasses were taken into account owing to their better thermal and water instability and unaffected fluorescence properties.…”

Fabrication and microstructure of perovskite CsPbCl3 nanocrystallized chalcogenide glass‐ceramics

“…In recent years, thus, various oxide glasses have been employed to protect CsPbX 3 perovskite nanocrystals. Novel photonic properties and applications were also explored in such glass‐ceramic materials, such as unique luminescence and random lasing properties . Nevertheless, the present preparation strategy of all the reported studies is to melt the corresponding halide and oxide reagents together and quench in an open atmosphere.…”