Experimental and theoretical investigation of 2D nanoplatelet-based conversion layers for color LED microdisplays

Quesnel, Etienne; Suhm, A.; Consonni, Marianne; Reymermier, Maryse; Lorin, G.; Laugier, Christelle; Tournaire, Myriam; Maître, Patrick Le; Lagrange, Alexandre; Racine, B.; D’Amico, Michele; Cao, Edgar

doi:10.1364/oe.425907

Cited by 12 publications

(9 citation statements)

References 23 publications

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“…Another area could be the use of internal strain in core/shell NPLs to achieve narrow emission in the red spectral range . In addition to electrically driven NPL-LEDs, color conversion NPL-LEDs that combine blue, UV, LED, and microLED chips with NPL-based phosphors could be beneficial for solid-state lighting and augmented reality applications. , Due to the large absorption cross section of NPLs, the amount of material required to achieve the desired level of colordown conversion can be reduced. Additionally, improvements on the EQE, roll-off currents, and stability are expected to improve the performance of NPL-LEDs to part or surpass that of QLEDs.…”

Section: Discussionmentioning

confidence: 99%

2D II–VI Semiconductor Nanoplatelets: From Material Synthesis to Optoelectronic Integration

Diroll

Güzeltürk

et al. 2023

Chem. Rev.

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The field of colloidal synthesis of semiconductors emerged 40 years ago and has reached a certain level of maturity thanks to the use of nanocrystals as phosphors in commercial displays. In particular, II−VI semiconductors based on cadmium, zinc, or mercury chalcogenides can now be synthesized with tailored shapes, composition by alloying, and even as nanocrystal heterostructures. Fifteen years ago, II−VI semiconductor nanoplatelets injected new ideas into this field. Indeed, despite the emergence of other promising semiconductors such as halide perovskites or 2D transition metal dichalcogenides, colloidal II−VI semiconductor nanoplatelets remain among the narrowest room-temperature emitters that can be synthesized over a wide spectral range, and they exhibit good material stability over time. Such nanoplatelets are scientifically and technologically interesting because they exhibit optical features and production advantages at the intersection of those expected from colloidal quantum dots and epitaxial quantum wells. In organic solvents, gram-scale syntheses can produce nanoparticles with the same thicknesses and optical properties without inhomogeneous broadening. In such nanoplatelets, quantum confinement is limited to one dimension, defined at the atomic scale, which allows them to be treated as quantum wells. In this review, we discuss the synthetic developments, spectroscopic properties, and applications of such nanoplatelets. Covering growth mechanisms, we explain how a thorough understanding of nanoplatelet growth has enabled the development of nanoplatelets and heterostructured nanoplatelets with multiple emission colors, spatially localized excitations, narrow emission, and high quantum yields over a wide spectral range. Moreover, nanoplatelets, with their large lateral extension and their thin short axis and low dielectric surroundings, can support one or several electron−hole pairs with large exciton binding energies. Thus, we also discuss how the relaxation processes and lifetime of the carriers and excitons are modified in nanoplatelets compared to both spherical quantum dots and epitaxial quantum wells. Finally, we explore how nanoplatelets, with their strong and narrow emission, can be considered as ideal candidates for pure-color light emitting diodes (LEDs), strong gain media for lasers, or for use in luminescent light concentrators.

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Section: Discussionmentioning

confidence: 99%

2D II–VI Semiconductor Nanoplatelets: From Material Synthesis to Optoelectronic Integration

Diroll

Güzeltürk

et al. 2023

Chem. Rev.

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“…Finally, to investigate the ability of the Cs 3 Mn x Zn (1– x ) Br 5 @PS film for application in a LCD, K 2 SiF 6 :Mn 4+ phosphor was introduced (630 nm) as a red emission source. The absorption coefficient, PLQY, thickness, and green–red ratio of the film all affect the color conversion of LCD devices. , Moreover, the effects of the Cs 3 Mn 0.6 Zn 0.4 Br 5 @K 2 SiF 6 :Mn 4+ @PS thickness and green–red ratio on the performance of LCD devices were discussed in detail. In this way, a series of films were prepared with different ratios and thicknesses, and the content ratios of Cs 3 Mn 0.6 Zn 0.4 Br 5 and K 2 SiF 6 :Mn 4+ were 1.00:0.005, 1.00:0.010, and 1.00:0.015, respectively.…”

Section: Resultsmentioning

confidence: 99%

Environmental-Friendly Cs₃Mn_xZn_(1–x)Br₅@PS Films Used for Wide Color Gamut Backlight Displays

Chen

et al. 2022

ACS Sustainable Chem. Eng.

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In recent years, all-inorganic metal lead halide cesium perovskites (CsPbX 3 , X = Cl, Br, and I) have shown excellent luminescence performance in the field of wide color gamut backlight displays. However, Pb 2+ in CsPbX 3 easily leaks because of the unstable structure of CsPbX 3 , which seriously threatens human health. However, Mn-based metal halides (MHs) have unique environmentally friendly characteristics. In this work, Zn 2+ -doped Cs 3 MnBr 5 MHs were successfully prepared, which exhibited highly efficient green emissions at 520−522 nm. Moreover, Cs 3 Mn x Zn (1−x) Br 5 shows excellent stability at room temperature (25 °C) compared with Cs 3 MnBr 5 . More excitingly, when Cs 3 Mn x Zn (1−x) Br 5 was encapsulated in a polystyrene (PS) polymer, Cs 3 Mn x Zn (1−x) Br 5 @PS showed better water, acid, daylight, and blue light stabilities. In addition, the backlight display device was designed based on different green−red ratios and thicknesses of Cs 3 Mn x Zn (1−x) Br 5 @K 2 SiF 6 :Mn 4+ @PS light conversion films, and the color gamut was over 109% of the NTSC 1953 standard, which is better than that of the reported WLED devices based on Mn-based MHs thus far. This work undoubtedly shows that Mn-based MHs have great application potential in wide color gamut backlight displays and provide a practicable route to fabricate nontoxic, low-cost, and high-performance liquid crystal displays. KEYWORDS: Cs 3 Mn x Zn (1−x) Br 5 , PS, stability, color gamut, backlight display

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“…Besides, the emission intensity's increase and subsequent decrease is also caused by the concentration quenching when doping Eu 2+ . The concentration quenching influences could be examined with the distance between the doped ions in the host lattice, also known as the energy-transfer critical distance (RC) (Quesnel et al, 2021;Yang et al, 2021). This RC can be expressed as the following computation:…”

Section: Baal14si06o34n06:eu 2+ Photoluminescence Analysismentioning

confidence: 99%

Utilization of BaAl1.4Si0.6O3.4N0.6:Eu2+ Green-emitting Phosphor to Improve Luminous Intensity and Color Adequacy of White Light-emitting Diodes

Thai¹,

Bui²,

Le³

et al. 2023

IJTech

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BaAl1.4Si0.6O3.4N0.6:Eu 2+ exhibiting broad excitation and emission bands with intense green emission centred at 510 nm is applied to produce high-performance white-light-emitting diodes (WLEDs). The preparation of the green phosphor utilizes NaNO3 molten salt to attain the purity phase and enhanced luminescence strength boosting the crystalline growth. The influences of BaAl1.4Si0.6O3.4N0.6:Eu 2+ on the lighting intensity and color adequacy are investigated at three correlated color temperatures (CCTs) of 3000 K, 4000 K and 5000 K. The lighting output of the WLEDs with high CCTs (4000 -5000 K) is deemed as enhanced with increasing green-phosphor concentration. The lower CCT shows greater lumen output when using a lower concentration of BaAl1.4Si0.6O3.4N0.6:Eu 2+ . This tendency also takes place in the case of color uniformity. Conversely, the high concentration of the phosphor is not favourable to the color rendition property of the WLED because of the excessive green-light proportion. It is recommended to keep the concentration of BaAl1.4Si0.6O3.4N0.6:Eu 2+ staying below 10 wt% for better color fidelity.

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Experimental and theoretical investigation of 2D nanoplatelet-based conversion layers for color LED microdisplays

Cited by 12 publications

References 23 publications

2D II–VI Semiconductor Nanoplatelets: From Material Synthesis to Optoelectronic Integration

2D II–VI Semiconductor Nanoplatelets: From Material Synthesis to Optoelectronic Integration

Environmental-Friendly Cs₃Mn_xZn_(1–x)Br₅@PS Films Used for Wide Color Gamut Backlight Displays

Utilization of BaAl1.4Si0.6O3.4N0.6:Eu2+ Green-emitting Phosphor to Improve Luminous Intensity and Color Adequacy of White Light-emitting Diodes

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Experimental and theoretical investigation of 2D nanoplatelet-based conversion layers for color LED microdisplays

Cited by 12 publications

References 23 publications

2D II–VI Semiconductor Nanoplatelets: From Material Synthesis to Optoelectronic Integration

2D II–VI Semiconductor Nanoplatelets: From Material Synthesis to Optoelectronic Integration

Environmental-Friendly Cs3MnxZn(1–x)Br5@PS Films Used for Wide Color Gamut Backlight Displays

Utilization of BaAl1.4Si0.6O3.4N0.6:Eu2+ Green-emitting Phosphor to Improve Luminous Intensity and Color Adequacy of White Light-emitting Diodes

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Environmental-Friendly Cs₃Mn_xZn_(1–x)Br₅@PS Films Used for Wide Color Gamut Backlight Displays