Highly Luminescent Cesium Lead Halide Perovskite Nanocrystals Stabilized in Glasses for Light‐Emitting Applications

Abstract

Cesium lead halide (CsPbX3) nanocrystals have great potential for photovoltaic and optoelectronic applications, but they are sensitive to oxygen, moisture, and light irradiation. Embedding these CsPbX3 nanocrystals into all‐inorganic amorphous solid matrices such as glass is expected to improve their stability. In this work, CsPbX3 nanocrystals are precipitated in boro‐germanate glasses with tunable composition, absorption, and photoluminescence. Quantum efficiency of CsPbBr3 nanocrystals in glass can be as high as ≈80% and ≈20% for CsPb(Cl/Br)3 and CsPb(Br/I)3 nanocrystals, respectively. Thermo‐ and photostabilities of CsPbX3 nanocrystals in glass are greatly improved due to the inert nature of glasses, and intense laser irradiation‐induced damage to CsPbX3 nanocrystals is recoverable through thermal annealing. With CsPbBr3 nanocrystal‐embedded glass slices, a green light‐emitting device with a luminous efficiency of ≈120 lm W−1 and an external quantum yield of ≈30% is achieved. A white‐light‐emitting device consisting of CsPbBr3 nanocrystals and CsPb(Br/I)3 nanocrystal–embedded glass slices shows luminous efficiency in the range of 50–60 lm W−1 and external quantum yield of 20–25%. The thermo‐ and photostabilities along with the chemical stability of CsPbX3 nanocrystal–embedded glasses are promising materials for photoluminescence related applications.

Recent advances in synthesis and application of perovskite quantum dot based composites for photonics, electronics and sensors

“…Melting-quenching with subsequent heat-treatment is always utilized for inorganic polymers including phospho-silicate glasses [24,93], tellurite-based glasses [94], borosilicate glasses [80,95] and boro-germanate glasses [80,96]. In this process, the properly designed glass matrix and the precursors of perovskite were firstly prepared and mixed together as powders.…”

Semiconductor Quantum Dots‐Embedded Inorganic Glasses: Fabrication, Luminescent Properties, and Potential Applications

“…[20,45] Recently, with the outstanding performance of halide perovskite materials in optoelectronic field, the halide perovskite QDs-embedded glasses become a new research hotspot, especially as potential alternatives to rare earth-based phosphors for lighting applications. [24]…”

“…As the halide is highly volatile at a high temperature, glasses chosen to precipitate CsPbX 3 NCs should have low melting point (<1300 °C), such as phosphate glasses, borosilicate glasses, and germinate glasses. [19,24,81] Glass can greatly improve the stability of CsPbX 3 NCs, which is crucial for the application of CsPbX 3 NCs because of notorious thermal and moisture vulnerability. As shown in Figure 11, CsPbBr 3 NC-embedded glasses showed typical bright green emission assigned to excitonic radiation.…”

“…Green light-emitting device with a luminous efficiency of 118 lm W −1 and an external quantum efficiency of 28.14% was obtained (Figure 12a,d). [24] However, the properties of red component was poor, lowering the luminous efficiency of the wLED. When combined CsPbBr 3 NCs (green-emitting, Figure 12a) with CsPbBrI 2 NCs (red-emitting, Figure 12b) embedded glass slices as light converters, white light with a luminous efficiency of 50-60 lm W −1 and external efficiency of 20-25% was realized (Figure 12c,e).…”

Ligand assisted swelling–deswelling microencapsulation (LASDM) for stable, color tunable perovskite–polymer composites

“…Meanwhile, many propose to mix PNC precursors with melted/dissolved inorganic matrices and grow PNCs in situ inside the matrices. [16][17][18] The inorganic matrices have the potential to deliver better protection than their organic counterpart, but perovskite/matrix phase separation is still an issue and the use of rigid substrates may result in poor exibility and scalability. Another method is in situ crystallization of PNCs directly inside solid organic matrices.…”