Sunlike White Light-Emitting Diodes Based on Rare-Earth-Free Luminescent Materials

Menéndez‐Velázquez, Amador; Morales, Dolores; García-Delgado, Ana Belén

doi:10.3390/ma15051680

Cited by 16 publications

(7 citation statements)

References 21 publications

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“…Once inside, the light can be spectrally converted to specific wavelengths in the UV-visible range for the activation of specific photodrugs. Spectral conversion techniques have already found applications in fields such as photovoltaics [35][36][37][38][39], LED lighting [40][41][42], greenhouses [43,44], ophthalmology [45], anti-counterfeiting [46][47][48], etc. The photopharmacology sector could also benefit from these spectral conversion techniques.…”

Section: A New Tool For Overcoming the Main Barriers Of Photopharmaco...mentioning

confidence: 99%

A Novel Photopharmacological Tool: Dual-Step Luminescence for Biological Tissue Penetration of Light and the Selective Activation of Photodrugs

Menéndez‐Velázquez¹,

García-Delgado²

2023

IJMS

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Conventional pharmacology lacks spatial and temporal selectivity in terms of drug action. This leads to unwanted side effects, such as damage to healthy cells, as well as other less obvious effects, such as environmental toxicity and the acquisition of resistance to drugs, especially antibiotics, by pathogenic microorganisms. Photopharmacology, based on the selective activation of drugs by light, can contribute to alleviating this serious problem. However, many of these photodrugs are activated by light in the UV–visible spectral range, which does not propagate through biological tissues. In this article, to overcome this problem, we propose a dual-spectral conversion technique, which simultaneously makes use of up-conversion (using rare earth elements) and down-shifting (using organic materials) techniques in order to modify the spectrum of light. Near-infrared light (980 nm), which penetrates tissue fairly well, can provide a “remote control” for drug activation. Once near-IR light is inside the body, it is up-converted to the UV–visible spectral range. Subsequently, this radiation is down-shifted in order to accurately adjust to the excitation wavelengths of light which can selectively activate hypothetical and specific photodrugs. In summary, this article presents, for the first time, a “dual tunable light source” which can penetrate into the human body and deliver light of specific wavelengths; thus, it can overcome one of the main limitations of photopharmacology. It opens up promising possibilities for the moving of photodrugs from the laboratory to the clinic.

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Section: A New Tool For Overcoming the Main Barriers Of Photopharmaco...mentioning

confidence: 99%

A Novel Photopharmacological Tool: Dual-Step Luminescence for Biological Tissue Penetration of Light and the Selective Activation of Photodrugs

Menéndez‐Velázquez¹,

García-Delgado²

2023

IJMS

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“…Solution processability, cheap cost, and low toxicity are a few of the reasons why photoluminescent organic materials [ 27 ] are attractive as wavelength converters for photonic technologies, with applications across a variety of industries, including photovoltaics [ 28 , 29 , 30 ], agriculture [ 31 , 32 ], ophthalmology [ 33 ], etc. In addition, the use of photoluminescent organic materials can also be advantageous for LED lighting [ 34 , 35 , 36 , 37 ].…”

Section: Introductionmentioning

confidence: 99%

Human-Centric Lighting: Rare-Earth-Free Photoluminescent Materials for Correlated Color Temperature Tunable White LEDs

Menéndez‐Velázquez¹,

García-Delgado²,

Morales³

2023

IJMS

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Artificial lighting is ubiquitous in modern society, with detrimental effects on sleep and health. The reason for this is that light is responsible not only for vision but also for non-visual functions, such as the regulation of the circadian system. To avoid circadian disruption, artificial lighting should be dynamic, changing throughout the day in a manner comparable to natural light in terms of both light intensity and associated color temperature. This is one of the main goals of human-centric lighting. Regarding the type of materials, the majority of white light-emitting diodes (WLEDs) make use of rare-earth photoluminescent materials; therefore, WLED development is at serious risk due to the explosive growth in demand for these materials and a monopoly on sources of supply. Photoluminescent organic compounds are a considerable and promising alternative. In this article, we present several WLEDs that were manufactured using a blue LED chip as the excitation source and two photoluminescent organic dyes (Coumarin 6 and Nile Red) embedded in flexible layers, which function as spectral converters in a multilayer remote phosphor arrangement. The correlated color temperature (CCT) values range from 2975 K to 6261 K, while light quality is preserved with chromatic reproduction index (CRI) values superior to 80. Our findings illustrate for the first time the enormous potential of organic materials for supporting human-centric lighting.

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“…In recent years, inorganic luminescent materials have attracted people's attention because of their wide applications in uorescence imaging, color display, white Light Emitting Diodes (LEDs) and so on. [1][2][3] Therefore, constructing and designing e cient inorganic luminescent materials has become a hot topic for material scientists. Zinc gallate (ZnGa 2 O 4 ), a ternary spinel material with a band gap of 4.4-4.7 eV, has exhibited excellent potential in future display system due to its prominent blue emission, high chemical and thermal stability, and good cathodoluminescence characteristics at low-voltage.…”

Section: Introductionmentioning

confidence: 99%

Preparation of ZnGa2O4 Nanoflowers and Their Full-color Luminescence Properties

Liu

Wan

Zheng

et al. 2023

Preprint

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Gallate material, a luminescent matrix with excellent performance is normally prepared by vapor deposition or solid phase sintering method at high temperature, however, it has not been solved to prepare gallate-based fluorescent materials with full-color luminescent properties at low temperature. In this paper, ZnGa2O4 undoped or doped with Cr or Mn nanoflowers composed of nanosheet-level structure were prepared by hydrothermal method at low temperature. Under ultraviolet light irradiation, ZnGa2O4, ZnGa2O4:Mn2+ and ZnGa2O4:Cr3+ display three primary colors of blue, green and red luminescence through self-excitation, Mn2+ and Cr3+ excitation respectively. The solid fluorescence yields of blue, green, and red colors are 32.3, 36.5, and 40.7%, respectively. It is highly expected to be applied to color display, biological imaging, white light devices.

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Sunlike White Light-Emitting Diodes Based on Rare-Earth-Free Luminescent Materials

Cited by 16 publications

References 21 publications

A Novel Photopharmacological Tool: Dual-Step Luminescence for Biological Tissue Penetration of Light and the Selective Activation of Photodrugs

A Novel Photopharmacological Tool: Dual-Step Luminescence for Biological Tissue Penetration of Light and the Selective Activation of Photodrugs

Human-Centric Lighting: Rare-Earth-Free Photoluminescent Materials for Correlated Color Temperature Tunable White LEDs

Preparation of ZnGa2O4 Nanoflowers and Their Full-color Luminescence Properties

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