High moisture resistance of an efficient Mn4+-activated red phosphor Cs2NbOF5:Mn4+ for WLEDs

Zhou, Jianbang; Chen, Yingyuan; Jiang, Chunyan; Milićević, Bojana; Мolokeev, Maxim S.; Brik, Mikhail G.; Бобриков, И.А.; Yan, Jing; Li, Junhao; Wu, Mingmei

doi:10.1016/j.cej.2020.126678

Cited by 70 publications

(33 citation statements)

References 42 publications

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“…The characteristic absorption bands of Mn 4+ for K 2 SiF 6 :Mn 4+ almost disappeared after immersion in water for 24 h, while a flat broad absorption band appeared in the wavelength range from ultraviolet to visible region, suggesting the hydrolysis of [MnF 6 ] 2− group and the undesirable presence of Mn 3+ related oxides and hydroxides. 23 The results indicated that BaTiF 6 :Mn 4+ phosphor exhibited much better water-attack stability than the commercial K 2 SiF 6 :Mn 4+ . Such excellent resistant behavior is quite similar to that reported for the BaSiF 6 :Mn 4+ phosphor.…”

Section: Resultsmentioning

confidence: 91%

“…After hydrolysis reaction for 24 h, the diffuse reflectance spectra of K 2 SiF 6 :Mn 4+ changed much more evidently than that of BaTiF 6 :Mn 4+ . The characteristic absorption bands of Mn 4+ for K 2 SiF 6 :Mn 4+ almost disappeared after immersion in water for 24 h, while a flat broad absorption band appeared in the wavelength range from ultraviolet to visible region, suggesting the hydrolysis of [MnF 6 ] 2– group and the undesirable presence of Mn 3+ related oxides and hydroxides . The results indicated that BaTiF 6 :Mn 4+ phosphor exhibited much better water-attack stability than the commercial K 2 SiF 6 :Mn 4+ .…”

Section: Resultsmentioning

confidence: 93%

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BaTiF₆:Mn⁴⁺ Red Phosphor: Synthesis of Single Crystals at Room Temperature and the High Hydrolysis-Resistant Property

Wang

et al. 2021

Inorg. Chem.

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Due to the low solubility of BaF2, the BaTiF6:Mn4+ phosphor for whitelight-emitting diodes application has been generally synthesized by the hydrothermal route, during which process the valence of the manganese dopant is difficult to be controlled as tetravalent. In this paper, a new synthesis method that proceeded at room temperature was reported. This method uses BaTiOF4 as the precursor and allows for the control of the phase transformation rate from BaTiOF4 to BaTiF6 in the K2MnF6/HF acid solution. Benefitting from that, we successfully prepared red-emitting BaTiF6:Mn4+ elongated crystals with a single-crystal nature up to a record-breaking length of 200–300 μm. The effects of the crystallinity of the BaTiOF4 precursor on its phase transformation rate into BaTiF6 and on the optimal Mn4+ doping concentration were studied. The BaTiF6:Mn4+ single-crystal phosphor exhibits relatively excellent hydrolysis-resistant behavior after being immersed in water for 3 h, at which condition the commercial K2SiF6:Mn4+ has become brown. This study may inspire the room-temperature preparation of other hydrolysis-resistant alkali earth fluorotitanate or fluorosilicate phosphors with stable tetravalent manganese doping.

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Section: Resultsmentioning

confidence: 91%

Section: Resultsmentioning

confidence: 93%

BaTiF₆:Mn⁴⁺ Red Phosphor: Synthesis of Single Crystals at Room Temperature and the High Hydrolysis-Resistant Property

Wang

et al. 2021

Inorg. Chem.

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“…2.6.2 Oxidation effect of Nb 5+ ions. In 2021, Zhou et al 39 synthesized Cs 2 NbOF 5 :Mn 4+ by co-precipitation, which surprisingly exhibited much better waterproofness than K 2 SiF 6 :Mn 4+ . When Cs 2 NbOF 5 :Mn 4+ was soaked in water, the solution became light yellow in the first 1-30 min, and then gradually turned purple over time (460 min).…”

Section: Materials Advances Reviewmentioning

confidence: 99%

Towards improved waterproofness of Mn⁴⁺-activated fluoride phosphors

Wang

2022

Mater. Adv.

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“…[230] In addition, the development of new phosphors and the structural modification of available phosphors also protects phosphors from moisture as the emitters are involved in the lattice. [231,232]…”

Section: Photostability Of Ds Phosphorsmentioning

confidence: 99%

Combinations of Superior Inorganic Phosphors for Level‐Tunable Information Hiding and Encoding

2021

Advanced Optical Materials

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Inorganic photoluminescence (PL) phosphors (including upconversion (UC), down‐shifting (DS), and persistent (PersL) materials) with tunable outputs, high quantum yields (QYs), and excellent photostability have attracted tremendous attention in advanced information hiding and encoding (IHE). The three kinds of phosphors endow security patterns in different IHE levels owing to their unique optical features. For security applications, it is very necessary to review how to boost optical performance and achieve multi‐level anti‐counterfeiting. Herein, diversely pivotal approaches on the achievement of multicolor emissions, high QYs, and excellent photostability are summarized. Full learning of these methods is promising to design superior inorganic phosphors. Based on the appealing optical properties of inorganic PL materials, a progressively improved IHE level is revealed by using unitary inorganic PL material, the couples of UCL, DS, and PersL, and further combinations together with external stimuli. This review not only deepens an understanding of designing high‐performance inorganic PL phosphors, but also gets inside into the construction of high‐performance IHE.

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High moisture resistance of an efficient Mn4+-activated red phosphor Cs2NbOF5:Mn4+ for WLEDs

Cited by 70 publications

References 42 publications

BaTiF₆:Mn⁴⁺ Red Phosphor: Synthesis of Single Crystals at Room Temperature and the High Hydrolysis-Resistant Property

BaTiF₆:Mn⁴⁺ Red Phosphor: Synthesis of Single Crystals at Room Temperature and the High Hydrolysis-Resistant Property

Towards improved waterproofness of Mn⁴⁺-activated fluoride phosphors

Combinations of Superior Inorganic Phosphors for Level‐Tunable Information Hiding and Encoding

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High moisture resistance of an efficient Mn4+-activated red phosphor Cs2NbOF5:Mn4+ for WLEDs

Cited by 70 publications

References 42 publications

BaTiF6:Mn4+ Red Phosphor: Synthesis of Single Crystals at Room Temperature and the High Hydrolysis-Resistant Property

BaTiF6:Mn4+ Red Phosphor: Synthesis of Single Crystals at Room Temperature and the High Hydrolysis-Resistant Property

Towards improved waterproofness of Mn4+-activated fluoride phosphors

Combinations of Superior Inorganic Phosphors for Level‐Tunable Information Hiding and Encoding

Contact Info

Product

Resources

About

BaTiF₆:Mn⁴⁺ Red Phosphor: Synthesis of Single Crystals at Room Temperature and the High Hydrolysis-Resistant Property

BaTiF₆:Mn⁴⁺ Red Phosphor: Synthesis of Single Crystals at Room Temperature and the High Hydrolysis-Resistant Property

Towards improved waterproofness of Mn⁴⁺-activated fluoride phosphors