Hybrid Inorganic‐Organic White Light Emitting Diodes

Mosca, Mauro; Macaluso, Roberto; Crupi, I.

doi:10.1002/9781119654643.ch8

Cited by 9 publications

(10 citation statements)

References 148 publications

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“…The presence of KCl, together with citric acid and L-cysteine as precursors, causes the CD’s blue fluorescence to be suppressed by AIQ, while longer wavelengths result in the enhancement of yellow emission. This phenomenon, which is well investigated for other dyes and organic fluorescent materials (see for instance, the exhaustive chapter reported in [ 100 ]), can be explained with reference to Figure 7 . When the CD concentration increases, the CDs assemble into aggregates.…”

Section: Color Conversion Cd-based Ledsmentioning

confidence: 55%

Color Conversion Light-Emitting Diodes Based on Carbon Dots: A Review

et al. 2022

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This paper reviews the state-of-the-art technologies, characterizations, materials (precursors and encapsulants), and challenges concerning multicolor and white light-emitting diodes (LEDs) based on carbon dots (CDs) as color converters. Herein, CDs are exploited to achieve emission in LEDs at wavelengths longer than the pump wavelength. White LEDs are typically obtained by pumping broad band visible-emitting CDs by an UV LED, or yellow–green-emitting CDs by a blue LED. The most important methods used to produce CDs, top-down and bottom-up, are described in detail, together with the process that allows one to embed the synthetized CDs on the surface of the pumping LEDs. Experimental results show that CDs are very promising ecofriendly candidates with the potential to replace phosphors in traditional color conversion LEDs. The future for these devices is bright, but several goals must still be achieved to reach full maturity.

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Section: Color Conversion Cd-based Ledsmentioning

confidence: 55%

Color Conversion Light-Emitting Diodes Based on Carbon Dots: A Review

et al. 2022

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“…Organic luminescent materials [ 16 ] are promising candidates as spectral converters for photonic technologies with applications in different fields, such as photovoltaics [ 17 , 18 ], farming [ 19 , 20 ], ophthalmology [ 21 ], etc., due to their promising features such as solution processability, cost-effectiveness, and low toxicity. LED lighting can also benefit from the use of luminescent organic materials [ 22 , 23 ]. The right choice of UV/blue LED and luminescent molecular system (phosphors) is key to achieving enhanced emissions spanning the entire visible region along with good quality light.…”

Section: Introductionmentioning

confidence: 99%

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

Menéndez‐Velázquez¹,

Morales²,

García-Delgado³

2022

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Solid-state lighting (SSL) sources based on light-emitting diodes represent the new generation of highly efficient illumination systems that significantly impact energy-saving. The development of white light-emitting diodes (WLEDs) with a combination of high color rendering index (CRI) and high deep-red color rendering R9 is an important challenge in the field of solid-state lighting. On the other hand, most WLEDs use rare-earth inorganic luminescent materials. The annual demand for rare-earth metals has doubled to 125,000 tons in 15 years, and the demand is projected to reach 315,000 tons in 2030. The explosion in demand for these materials, combined with a monopolistic supply source, represents a real risk for the development of WLEDs in the next few years. Luminescent organic materials are a relevant and promising alternative. Here, we report a WLED with a very high CRI of 95.7 and R9 of 78.7, obtained using a combination of a blue LED chip (excitation source) and two organic luminescent dyes (Coumarin 6 and Lumogen Red) acting as spectral converters in a multilayer remote phosphor configuration. To the best of our knowledge, this is the first rare-earth-free WLED with such high values of CRI and R9.

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“…[4]. Current phosphors are almost all based on rare-earth metals and their self-quenching and absorption effects lower the phosphor performances [10]. Therefore, it is urgent to develop new phosphors, especially organic luminescent phosphors.…”

Section: Introductionmentioning

confidence: 99%

“…One is the aggregation caused quenching (ACQ) effect induced by π-π stacking interactions of the organic dyes, which results in low fluorescence intensity in solid states in comparison with their bright solution states. Additionally, the other is the thermal and photo-stability of organic dyes [10]. MOFs are ideal supporting materials to prevent organic dyes aggregating in solid states [21,22], since MOFs are highly porous and able to encapsulate molecular dyes in confined pores, so they are capable of preventing aggregation-induced quenching and restricting internal molecular motions to inhibit nonradiative relaxation [23].…”

Section: Introductionmentioning

confidence: 99%

“…MOFs materials with porosity, multifunctionality and crystallinity have aroused much interest since the debut of the "metal-organic frameworks" concept in 1995 [24], and the scope of this research has expanded from structure design and topology analysis to a wide range of applications in gas storage, catalysis and biomedicine [11,12,[25][26][27][28]. A number of excellent reviews have summarized the properties and applications of luminescent metal-organic frameworks (LMOFs) [8,10,[13][14][15]17,19,20,[29][30][31][32], while the reviews that specifically and systemically discuss the encapsulation of organic dyes in MOFs (dye@MOFs) for WLEDs applications are still rare. This review mainly summarizes recent progress achieved in developing pc-WLEDs based on dye@MOFs, where white light can be generated by coating the dye encapsulated MOF hybrids on the corresponding blue-LED chip or UV-LED chip.…”

Section: Introductionmentioning

confidence: 99%

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Encapsulation of Dyes in Luminescent Metal-Organic Frameworks for White Light Emitting Diodes

et al. 2021

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The development of white light emitting diodes (WLEDs) holds great promise for replacing traditional lighting devices due to high efficiency, low energy consumption and long lifetime. Metal–organic frameworks (MOFs) with a wide range of luminescent behaviors are ideal candidates to produce white light emission in the phosphor-converted WLEDs. Encapsulation of emissive organic dyes is a simple way to obtain luminescent MOFs. In this review, we summarize the recent progress on the design and constructions of dye encapsulated luminescent MOFs phosphors. Different strategies are highlighted where white light emitting phosphors were obtained by combining fluorescent dyes with metal ions and linkers.

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Hybrid Inorganic‐Organic White Light Emitting Diodes

Cited by 9 publications

References 148 publications

Color Conversion Light-Emitting Diodes Based on Carbon Dots: A Review

Color Conversion Light-Emitting Diodes Based on Carbon Dots: A Review

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

Encapsulation of Dyes in Luminescent Metal-Organic Frameworks for White Light Emitting Diodes

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