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.

CsPbX3 (X = Br, I) QD embedded glasses are fabricated via a glass crystallization strategy, exhibiting tunable luminescence and superior thermal stability.

In the past few decades, efficient photon upconversion (anti-Stokes) luminescence has been extensively studied and is almost exclusively restricted to lanthanide (Ln3+) doped fluorophores.

CsPbX3 (X = Cl, Br, I and their mixture) QDs@glass nanocomposites are fabricated via a facile in situ glass crystallization strategy, exhibiting full-spectral visible emissions, superior thermal stability and water resistance.

Non-rare-earth Mn-doped double-perovskite (BaSr )YSbO:Mn red-emitting phosphors with adjustable photoluminescence are fabricated via traditional high-temperature sintering reaction. The structural evolution, variation of Mn local environment, luminescent properties, and thermal quenching are studied systematically. With elevation of Sr substituting content, the major diffraction peak moves up to a higher angle gradually. Impressively, with increasing the substitution of Ba with Sr cation from 0 to 100%, the emission band shifts to short-wavelength in a systematic way resulting from the higher transition energy from excited states to ground states. Besides, this blue-shift appearance can be illuminated adequately using the crystal field strength. The thermal quenching of the obtained solid solution is dramatically affected by the composition, with the PL intensity increasing 16% at 423 K going from x = 0 to 1.0. The w-LEDs component constructed by coupling the UV-LED chip with red/green/blue phosphors demonstrate an excellent correlated color temperature (CCT) of 3404 K, as well as color rendering index (CRI) of 86.8.

Mn(ii) doping into a CsPb(Cl/Br)3 perovskite lattice is realized via an in situ glass crystallization strategy for the first time.

Long-wavelength orange-red emissions of carbon dots have recently attracted great attention due to their wide applications. Although it is possible to achieve long-wavelength luminescence by varying the incident excitation wavelength, excitation-independency is highly desired in terms of both practical applications and understanding emission mechanisms. In the present work, carbon dots with excitation wavelength independent orange and blue dual-color emissions were synthesized by a facile solvothermal route using p-phenylenediamine as carbon source and formamide as solvent. Structural and spectroscopic characterizations indicated that N-and O-related surfacestate controlling via modifying reacting temperature/time was responsible for the dual-color emissions of carbon dots. Moreover, carbon solid film, retaining original orange emissions, was fabricated to explore its possible application as color converter in solidstate lighting. Impressively, by combining orange carbon film and yellow phosphor-in-glass with an InGaN blue chip, lightemitting diode devices with improved color-rendering index and correlated color temperature were successfully constructed.

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