Recent advances in the development of pure organic white light emitters

Anand, Vishal; Mishra, Roli; Barot, Yash B.

doi:10.1016/j.dyepig.2021.109390

Cited by 51 publications

(25 citation statements)

References 101 publications

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“…15 Various single-component WLEMs emerge endlessly. 16,17 To date, the single-component WLEMs can be mainly divided into inorganic (such as ZnCdS, 18 CdSe, 19 etc. ), organic (including small molecules and polymers), [20][21][22][23] and organic-inorganic hybrid materials (such as metal-organic frameworks, semiconductors, and metal complexes etc.).…”

Section: Introductionmentioning

confidence: 99%

Regulation strategy of white emission from organic–inorganic hybrid metal halide perovskites

Kang

Lin

2023

Inorg. Chem. Front.

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Section: Introductionmentioning

confidence: 99%

Regulation strategy of white emission from organic–inorganic hybrid metal halide perovskites

Kang

Lin

2023

Inorg. Chem. Front.

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Section: Introductionmentioning

confidence: 99%

“…White-light-emitting diodes (WLEDs) are considered to play a significant role in next-generation lighting and display devices on account of their merits of high efficiency, long lifetime, and energy savings over traditional incandescent bulbs and fluorescent lamps. , Nowadays, the most straightforward method for the fabrication of WLEDs is to couple a blue emitting chip with green and red emitting fluorescent materials. , However, such WLEDs usually suffer from poor color-rendering indices (CRI < 75) . Meanwhile, blue light retinal injuries arising from a strong blue spike in the white-light spectrum prevents this technology from widespread applications. − To reduce light toxicity of the blue chip, an ultraviolet (UV)-LED chip is selected as the light source to excite a mixture of trichromatic [red-(R)/green-(G)/blue-(B)] phosphors for the construction of WLEDs.…”

Section: Introductionmentioning

confidence: 99%

Efficient One-Pot Synthesis of Bright Blue-Emitting Ce³⁺-Based Phosphor: Application for the Construction of Warm White-Light-Emitting Diodes and Anticounterfeiting

Huang

Lei

et al. 2022

ACS Appl. Electron. Mater.

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In the present investigation, we demonstrated a simple approach for the reproducible synthesis of cerium(III)-based blue phosphor, which provides versatile applications in the construction of warm white-light-emitting diodes (WLEDs) and anticounterfeiting patterns. It is found that the mixture of dipicolinic acid (DPA) with Ce3+ in ethanol (DPA-Ce) emits blue fluorescence under the assistance of ultraviolet (UV) induction. The quantum yield of the DPA-Ce phosphor reaches 44% and is improved to 52% by combining with guanosine 5′-monophosphate (GMP). The obtained DPA-Ce-GMP emits blue fluorescence in both a solid powder and aqueous solution, having advantages of long luminescence lifetimes, ultralong stability, and outstanding antitemperature bleaching. With DPA as a universal ligand, DPA-Tb with green fluorescence and DPA-Eu with red fluorescence are integrated with the blue fluorescence of DPA-Ce-GMP to construct full-color and white-light-emitting devices. The as-prepared warm WLED with a quantum yield of 64% presents an excellent stability and high quality with a color rending index of up to 90, CIE color coordinates of (0.37, 0.36), a correlated color temperature of 3950 K, and a luminous efficiency of 37.8 lm W–1. Multiple anticounterfeiting patterns are further encoded with the as-prepared lanthanide-based phosphors. The investigation offers a simple assay for the cost-effective, large-scale synthesis of phosphors, with great promise in diverse applications including the lighting industry and anticounterfeiting technology.

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“…Organic light-emitting diodes (OLEDs) are a well-established technology for full-color light-emitting displays [ 1 ] and hold promise for future applications such as skin-wearable devices [ 2 ], white-light emitting sources [ 3 , 4 ] and biomedical purposes [ 5 , 6 ].…”

Section: Introductionmentioning

confidence: 99%

New Light-Green Thermally Activated Delayed Fluorescence Polymer Based on Dimethylacridine-Triphenyltriazine Light-Emitting Unit and Tetraphenylsilane Moiety as Non-Conjugated Backbone

et al. 2022

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In the search for solution-processable TADF materials as a light emitting layer for OLED devices, polymers have attracted considerable attention due to their better thermal and morphological properties in the film state with respect to small molecules. In this work, a new polymer (p-TPS-DMAC-TRZ) with thermally activated delayed fluorescence (TADF) light-emitting characteristics was prepared from a conjugation-break unit (TPS) and a well-known TADF core (DAMC-TRZ). This material was designed to preserve the photophysical properties of DAMC-TRZ, while improving other properties, such as thermal stability, promoted by its polymerization with a TPS core. Along with excellent solubility in common organic solvents such as toluene, chloroform and THF, the polymer (Mn = 9500; Mw = 15200) showed high thermal stability (TDT5% = 481 °C), and a Tg value of 265 °C, parameters higher than the reference small molecule DMAC-TRZ (TDT5% = 305 °C; Tg = 91 °C). The photoluminescence maximum of the polymer was centered at 508 nm in the solid state, showing a low redshift compared to DMAC-TRZ (500 nm), while also showing a redshift in solution with solvents of increasing polarity. Time-resolved photoluminescence of p-TPS-DMAC-TRZ at 298 K, showed considerable delayed emission in solid state, with two relatively long lifetimes, 0.290 s (0.14) and 2.06 s (0.50), and a short lifetime of 23.6 ns, while at 77 K, the delayed emission was considerably quenched, and two lifetimes in total were observed, 24.6 ns (0.80) and 180 ns (0.20), which was expected from the slower RISC process at lower temperatures, decreasing the efficiency of the delayed emission and demonstrating that p-TPS-DMAC-TRZ has a TADF emission. This is in agreement with room temperature TRPL measurements in solution, where a decrease in both lifetime and delayed contribution to total photoluminescence was observed when oxygen was present. The PLQY of the mCP blend films with 1% p-TPS-DMAC-DMAC-TRZ as a dopant was determined to be equal to 0.62, while in the pure film, it was equal to 0.29, which is lower than that observed for DMAC-TRZ (0.81). Cyclic voltammetry experiments showed similarities between p-TPS-DMAC-TRZ and DAMC-TRZ with HOMO and LUMO energies of −5.14 eV and −2.76 eV, respectively, establishing an electrochemical bandgap value of 2.38 eV. The thin film morphology of p-TPS-DMAC-TRZ and DMAC-TRZ was compared by AFM and FE-SEM, and the results showed that p-TPS-DMAC-TRZ has a smoother surface with fewer defects, such as aggregations. These results show that the design strategy succeeded in improving the thermal and morphological properties in the polymeric material compared to the reference small molecule, while the photophysical properties were mostly maintained, except for the PLQY determined in the pure films. Still, these results show that p-TPS-DMAC-TRZ is a good candidate for use as a light-emitting layer in OLED devices, especially when used as a host-guest mixture in suitable materials such as mCP.

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Recent advances in the development of pure organic white light emitters

Cited by 51 publications

References 101 publications

Regulation strategy of white emission from organic–inorganic hybrid metal halide perovskites

Regulation strategy of white emission from organic–inorganic hybrid metal halide perovskites

Efficient One-Pot Synthesis of Bright Blue-Emitting Ce³⁺-Based Phosphor: Application for the Construction of Warm White-Light-Emitting Diodes and Anticounterfeiting

New Light-Green Thermally Activated Delayed Fluorescence Polymer Based on Dimethylacridine-Triphenyltriazine Light-Emitting Unit and Tetraphenylsilane Moiety as Non-Conjugated Backbone

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Recent advances in the development of pure organic white light emitters

Cited by 51 publications

References 101 publications

Regulation strategy of white emission from organic–inorganic hybrid metal halide perovskites

Regulation strategy of white emission from organic–inorganic hybrid metal halide perovskites

Efficient One-Pot Synthesis of Bright Blue-Emitting Ce3+-Based Phosphor: Application for the Construction of Warm White-Light-Emitting Diodes and Anticounterfeiting

New Light-Green Thermally Activated Delayed Fluorescence Polymer Based on Dimethylacridine-Triphenyltriazine Light-Emitting Unit and Tetraphenylsilane Moiety as Non-Conjugated Backbone

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Efficient One-Pot Synthesis of Bright Blue-Emitting Ce³⁺-Based Phosphor: Application for the Construction of Warm White-Light-Emitting Diodes and Anticounterfeiting