Conversion phosphors: an overview

Nair, Govind B.; Tamboli, Sumedha; Dhoble, S.J.; Swart, H.C.

doi:10.1016/b978-0-323-90539-8.00012-7

Cited by 11 publications

(12 citation statements)

References 141 publications

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“…The present commercial WLEDs with high color rendering index (CRI) and tunable correlate color temperature (CCT) are usually consisting of near‐ultraviolet/blue InGaN/GaN chips combined with multiple luminescent components. [ 1–6 ] However, the fabricating technology of the WLEDs devices based on coating multiple luminescent materials on semiconductor chips is complicated. The self‐absorption effects and the different properties of the multiple components usually cause a decrease in luminous efficacy and a deviation in chromaticity color over a long‐working time.…”

Section: Introductionmentioning

confidence: 99%

Precise Hue Control in a Single‐Component White‐Light Emitting Perovskite Cs₂SnCl₆ through Defect Engineering Based on La³⁺ Doping

Zhu

Pan

Peng

et al. 2023

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of effective energy regulation strategies, which facilitates the progress in the development of white light sources. The present commercial WLEDs with high color rendering index (CRI) and tunable correlate color temperature (CCT) are usually consisting of near-ultraviolet/ blue InGaN/GaN chips combined with multiple luminescent components. [1][2][3][4][5][6] However, the fabricating technology of the WLEDs devices based on coating multiple luminescent materials on semiconductor chips is complicated. The self-absorption effects and the different properties of the multiple components usually cause a decrease in luminous efficacy and a deviation in chromaticity color over a long-working time. Therefore, single-component white light emitters, including multiple luminescence centers, are attractive for high stability in a light color and facile fabrication in large quantities of manufacture. [7][8][9] In recent years, the all-inorganic perovskites have evoked tremendous attention due to their excellent optoelectronic properties originating from the formation of selftrapped excitons (STEs) caused by the localized charge distribution and strong carrier-phonon coupling. [10][11][12] The early studies were mainly focused on the multidimensional halide perovskites with intrinsic STE emissions, including 3D (Cs 2 AgInCl 6 PLQY ≈6.5%, Cs 2 NaInCl 6 PLQY ≈7%), 2D (Cs 3 Bi 2 Br 9 PLQY ≈4.5%, Cs 3 Sb 2 Cl 9 PLQY ≈11%), and 1D (CsCu 2 I 3 PLQY ≈9%) perovskites. [13][14][15][16][17] Although these compounds show broadband emission with large Stokes shift, their low PLQYs (< 15%) seriously limit their applications. 0D metal halides of the vacancy-ordered structure have attracted extensive attention because their isolated polyhedral units promote charge recombination, thus facilitating the formation of broadband STE emissions. [18][19][20][21][22][23][24][25] It was reported that the crystals of Bi 3+ /Sb 3+ co-doped Cs 2 ZrCl 6 (PLQY ≈55%) and Bi 3+ /Te 4+ co-doped Cs 2 HfCl 6 (PLQY ≈66%) show efficient dual broad emissions with a high quantum yield, which is assigned to the good compatibility structures of the hosts as well as the effective tailoring the electronic and optical properties via induction of defects. [18][19][20][21] The perovskite compound Cs 2 SnCl 6 was regarded as an excellent host because of its nontoxicity, low cost, simple structure, good compatibility, and electronically decoupled 0D structure that favors the formation of STEs. [22][23][24][25] A new class of white-light emitters based on Bi 3+ Single-component white light emitters based on the all-inorganic perovskites will act as outstanding candidates for applications in solid-state lighting thanks to their abundant energy states for self-trapped excitons (STE) with ultra-high photoluminescence (PL) efficiency. Here, a complementary white light is realized by dual STEs emissions with blue and yellow colors in a single-component perovskite Cs 2 SnCl 6 :La 3+ microcrystal (MC). The dual emission bands centered at 450 and 560 nm are attributed to the intrinsi...

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Section: Introductionmentioning

confidence: 99%

Precise Hue Control in a Single‐Component White‐Light Emitting Perovskite Cs₂SnCl₆ through Defect Engineering Based on La³⁺ Doping

Zhu

Pan

Peng

et al. 2023

Small

View full text Add to dashboard Cite

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“…4 Generally, the phosphors most commonly used in LEDs are fluorides, sulphides, silicates, oxides, nitrides, and oxynitrides. However, some problems are found with these phosphors, limiting their applications in LEDs, that is, fluoride-and sulphide-based phosphors are very sensitive to moisture, making luminescent intensity dramatically degrade; [5][6][7] silicate-and oxidebased phosphors have low emission efficiency and so with difficulty are used for high-efficiency LEDs; [8][9][10][11] and nitride-and oxynitridebased phosphors exhibit serious thermal degradation, 2,12-14 which causes a short life time for the LED devices.…”

Section: Introductionmentioning

confidence: 99%

Research progress on surface modifications for phosphors used in light-emitting diodes (LEDs)

Zhang,

Uchikoshi,

Takeda

et al. 2023

Phys. Chem. Chem. Phys.

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“…In the quest for highly performing artificial lighting sources, inorganic light‐emitting diodes (LEDs) stand out. [ 1–3 ] However, sustainability and health issues are related to the use of inorganic phosphors (IPs) that i) are based on either rare‐earth or toxic photon down‐converting emitters, [ 4 ] ii) leave a strong blue component responsible for alteration of the circadian rhythm and damage at the eye photoreceptors, [ 5 ] and iii) are not efficiently recycled to date. [ 6 ] Thus, IPs are considered as the major concern toward the next generation of the artificial lighting based on the LED technology.…”

Section: Introductionmentioning

confidence: 99%

Homopolymeric Protein Phosphors: Overpassing the Stability Frontier of Deep‐Red Bio‐Hybrid Light‐Emitting Diodes

Ferrara

Fernandéz‐Blázquez

Werner

et al. 2023

Adv Funct Materials

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Although protein-polymer phosphors are an emerging photon-management filter concept for hybrid light-emitting diodes, deep-red-emitting devices based on archetypal fluorescent proteins (FPs; mCherry) are still poorly performing with lifetimes <50 h under high photon-flux excitation and ambient conditions. Here, the challenge is two-fold: i) understanding the deactivation mechanism of red-emitting FP-polymer coatings and, in turn, ii) identifying the best polymer design for highly stable devices. This study first provides comprehensive photophysical/thermal/structural studies and device degradation (ambient/ inert) analysis, revealing the presence of photo-induced cis-trans isomerization and the effect of oxygen and water on the deactivation of mCherry in reference polymer coatings. Based on these findings, a new bio-phosphor configuration using polyvinyl alcohol derivatives, in which crystallinity and amount of trapped water (stiffness and oxygen/moisture barriers) are easily controlled by the hydroxylation degree, is successfully achieved. Compared to the prior art, these devices significantly outperform the reference stability (>50-fold enhancement), showing a brightness loss of <5% over the first 2000 h and a final device lifetime of 2600 h. Hence, this study describes a unique rationale toward designing polymers to stabilize FPs for lighting, overpassing stability frontiers in deep-red hybrid light-emitting diodes (HLEDs) going from hours to months.

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Conversion phosphors: an overview

Cited by 11 publications

References 141 publications

Precise Hue Control in a Single‐Component White‐Light Emitting Perovskite Cs₂SnCl₆ through Defect Engineering Based on La³⁺ Doping

Precise Hue Control in a Single‐Component White‐Light Emitting Perovskite Cs₂SnCl₆ through Defect Engineering Based on La³⁺ Doping

Research progress on surface modifications for phosphors used in light-emitting diodes (LEDs)

Homopolymeric Protein Phosphors: Overpassing the Stability Frontier of Deep‐Red Bio‐Hybrid Light‐Emitting Diodes

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Conversion phosphors: an overview

Cited by 11 publications

References 141 publications

Precise Hue Control in a Single‐Component White‐Light Emitting Perovskite Cs2SnCl6 through Defect Engineering Based on La3+ Doping

Precise Hue Control in a Single‐Component White‐Light Emitting Perovskite Cs2SnCl6 through Defect Engineering Based on La3+ Doping

Research progress on surface modifications for phosphors used in light-emitting diodes (LEDs)

Homopolymeric Protein Phosphors: Overpassing the Stability Frontier of Deep‐Red Bio‐Hybrid Light‐Emitting Diodes

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Product

Resources

About

Precise Hue Control in a Single‐Component White‐Light Emitting Perovskite Cs₂SnCl₆ through Defect Engineering Based on La³⁺ Doping

Precise Hue Control in a Single‐Component White‐Light Emitting Perovskite Cs₂SnCl₆ through Defect Engineering Based on La³⁺ Doping