Broad-Band and Stable Phosphor-in-Glass Enabling Ultrahigh Color Rendering for All-Inorganic High-Power WLEDs

Peng, Yang; Wang, Hao; Liu, Jiaxin; Sun, Qinglei; Mou, Yun; Guo, Xing

doi:10.1021/acsaelm.0c00557

Cited by 34 publications

(10 citation statements)

References 48 publications

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“…As shown in Table 4, R9 and R13 of these four formulas were in the range of 99-84 and 98-92, respectively. We further evaluated the color rendering, the new color index (IES TM-30-2015) was employed in this study, which consists of a fidelity index (Rf), and a gamut index (Rg) [14,15]. The results were also shown in Table 4.…”

Section: Resultsmentioning

confidence: 99%

High Performance and Reliability of Two-Inch Phosphor-in-Glass for White Light-Emitting Diodes Employing Novel Wet-Type Cold Isostatic Pressing

et al. 2021

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High color rendering index (CRI) of 97 and wide correlated-color temperatures (CCTs) range of 2100-7600 K in white light-emitting diodes (WLEDs) employing the two-inch diameter of CaAlSiN3: Eu 2+ (red phosphor) and Lu3Al5O12: Ce 3+ (green phosphor) co-doped phosphor-in-glass (PiG) are demonstrated by a novel wet-type cold isostatic pressing (CIP) technique. The wet-type CIP enable to apply isostatic pressure to a powder sample in all directions to obtain the PiG with excellent optical properties, high reliability, and thermal stability. The high CRI of 97 and the wide CCTs range of 2100-7600 K achieved are mainly due to the optimized phosphor materials and the precise adjustment thickness of the PiG. Based on the best formula of two-inch diameter PiG and a unique process of wet-type CIP, we have successfully fabricated and demonstrated the good uniformity and excellent performances of a large diameter of two-inch PiG. The proposed of a large diameter of two-inch PiG with excellent performance, high reliability, and thermal stability is essential to meet the economic dimension requirement for commercial usages in high-quality WLEDs indoor lighting applications.

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Section: Resultsmentioning

confidence: 99%

High Performance and Reliability of Two-Inch Phosphor-in-Glass for White Light-Emitting Diodes Employing Novel Wet-Type Cold Isostatic Pressing

et al. 2021

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“…Rare-earth phosphors N.A. 95 95 91 102 [20] Perovskite quantum dots 61% 96 N.A. 91 99 [12] Carbon quantum dots a) 63% 97 N.A.…”

Section: Resultsmentioning

confidence: 99%

Naturally Derived Organic Dyes for LED Lightings of High Color Rendering and Fidelity Index

Huang¹,

Cohen²,

Luscombe³

2021

Preprint

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<p>Light-emitting diodes (LEDs) are a lighting technology with a huge and ascending market. Typically, LED backlights are often paired with inorganic phosphors made from rare-earth elements (REEs) to tune the emission lineshapes for different applications. However, REE production is a resource-intensive process with many negative environmental impacts. Herein we develop organic hybrid LEDs using organic dyes synthesized from an abundant and non-toxic natural product (theobromine) to replace REE phosphors. The resulting hybrid LED generates continuous emission from 400 – 740 nm, resulting in high color rendering index (the current industry standard) of 90 and color fidelity index (the most advanced and comprehensive standard) of 92, challenging commercial LEDs based on REE phosphors. In addition, the light-converting composite is made from 99 wt% SBS, an inexpensive industrial polymer, and 1wt% theobromine dyes, reducing the cost of the light converter to ¢1.30 for a 1 W LED, compared to approximately ¢ 19.2 of commercial products. The light converting efficiency of the dye-SBS composite is 82%. Excited state kinetics experiments were also conducted to provide guidance to further increase the light-converting efficiency of the theobromine dyes while maintaining excellent color rendering and fidelity. </p>

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“…Fortunately, the combination of mixed red-green-blue (RGB) phosphors and near-ultraviolent (NUV)/ultraviolet (UV) LED chips can improve the quality of white LED devices due to their achievement of an ideal white glow. Some researchers considered that the limited light efficiency and high cost of RGB phosphors will restrict the sustainable development of white LED devices, so they still focus on the color quality enhancement of white LED based on the yellow phosphors and blue chip [6][7][8][9]. Note that most researchers will use red-emitting phosphors.…”

Section: Introductionmentioning

confidence: 99%

Rare-earth and transition metal ion single-/co-doped double-perovskite tantalate phosphors: Validation of suitability for versatile applications

Hua¹,

Yu²,

Li³

2023

Journal of Advanced Ceramics

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Novel rare-earth (Eu 3+ , Sm 3+ , and Pr 3+ ) and transition metal (Mn 4+ ) ions single/co-doped double-perovskite Ca2InTaO6 (CITO) phosphors were prepared and investigated with respect to their crystal structure and photoluminescence (PL) properties. Among them, CITO:Eu 3+ phosphors were found to exhibit an ultra-high internal PL quantum yield (89.1%) and good thermal stability (78.7% at 423 K relative to the initial value at 303 K). As such, the corresponding packaged white lighting-emitting diode (LED) was able to display a remarkable color rendering index (color rendering index = 91.51@10 mA). Besides, the potential in the application of anti-counterfeiting fields and a novel LED structure based on flexible phosphor-converted films were also studied. Moreover, due to their different thermal quenching, trivalent lanthanide (Ln 3+ )/Mn 4+ co-doped CITO phosphors were designed for optical thermometry based on the luminescence intensity ratio (LIR) between different 4f transitions of various Ln 3+ ions and 2 Eg → 4 A2g (Mn 4+ ) transition.Particularly, the LIR between the 4 G5/2 → 6 H9/2 and 2 Eg → 4 A2g peaks of the CITO activated with 5 mol% Sm 3+ and 0.3 mol% Mn 4+ exhibited the most excellent relative sensing sensitivity (3.80% K -1 ) with a beneficial temperature uncertainty of 0.0648 K.Overall, these results are of significance to offer valuable databases for constructing multifunctional high-performance optical platforms using single/co-doped double-perovskite tantalates.

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Broad-Band and Stable Phosphor-in-Glass Enabling Ultrahigh Color Rendering for All-Inorganic High-Power WLEDs

Cited by 34 publications

References 48 publications

High Performance and Reliability of Two-Inch Phosphor-in-Glass for White Light-Emitting Diodes Employing Novel Wet-Type Cold Isostatic Pressing

High Performance and Reliability of Two-Inch Phosphor-in-Glass for White Light-Emitting Diodes Employing Novel Wet-Type Cold Isostatic Pressing

Naturally Derived Organic Dyes for LED Lightings of High Color Rendering and Fidelity Index

Rare-earth and transition metal ion single-/co-doped double-perovskite tantalate phosphors: Validation of suitability for versatile applications

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