Multicolor Semiconductor Lasers

Zhuang, Xiujuan; Ouyang, Yongzhong; Wang, Xiaoxia; Pan, Anlian

doi:10.1002/adom.201900071

Cited by 33 publications

(22 citation statements)

References 106 publications

(210 reference statements)

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“…[ 1–4 ] Among them, LEDs have attracted particular attentions for the potential applications in multi‐color display, low‐cost back‐lighting in liquid‐crystal displays, and next‐generation lighting sources for our daily life. The typical materials developed in these areas include molecular nanomaterials, [ 5,6 ] rare‐earth‐based nanoparticles, [ 7,8 ] semiconductor quantum dots, [ 9,10 ] and organic fluorescent dyes. [ 11,12 ] However, low emission quantum yields (QYs), susceptibility to photobleaching, and complicated fabrication have limited the wide adoption of these materials.…”

Section: Introductionmentioning

confidence: 99%

Rational Design of Multi‐Color‐Emissive Carbon Dots in a Single Reaction System by Hydrothermal

et al. 2020

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As an emerging building unit, carbon dots (CDs) have been igniting the revolutionaries in the fields of optoelectronics, biomedicine, and bioimaging. However, the difficulty of synthesizing CDs in aqueous solution with full‐spectrum emission severely hinders further investigation of their emission mechanism and their extensive applications in white light emitting diodes (LEDs). Here, the full‐color‐emission CDs with a unique structure consisting of sp3‐hybridized carbon cores with small domains of partially sp2‐hybridized carbon atoms are reported. First‐principle calculations are initially used to predict that the transformation from sp3 to sp2 hybridization redshifts the emission of CDs. Guided by the theoretical predictions, a simple, convenient, and controllable route to hydrothermally prepare CDs in a single reaction system is developed. The prepared CDs have full‐spectrum emission with an unprecedented two‐photon emission across the whole visible color range. These full‐color‐emission CDs can be further nurtured by slight modifications of the reaction conditions (e.g., temperature, pH) to generate the emission color from blue to red. Finally a flexible LEDs with full‐color emission by using epoxy CDs films is developed, indicating that the strategy affords an industry translational potential over traditional fluorophores.

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Section: Introductionmentioning

confidence: 99%

Rational Design of Multi‐Color‐Emissive Carbon Dots in a Single Reaction System by Hydrothermal

et al. 2020

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“…Thus, planar PSCs (aperture area > 1 cm 2 ) with a certified PCE higher than 15% were fabricated. [12] On the other hand, bandgap engineering on heterostructure has been implemented on different semiconductors to extend the optical absorption/emission bandwidth to achieve white light-emitting devices, [16,17] multiwavelength lasers, [18,19] photocatalytic hydrogen generation, [20] and broadband photodetectors. [21,22] Perovskites also have been combined with other semiconductors to construct heterostructures.…”

Section: Introductionmentioning

confidence: 99%

Highly Efficient Charge Transfer between Perovskite Nanocrystals and g‐C₃N₄ Nanosheets

Sheng

Zhao

et al. 2020

Physica Status Solidi (b)

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Benefiting from the bandgap engineering implemented on two different structures, heterostructures have significantly extended the applications of semiconductors. Thus, understanding the energy/charge transfer of heterostructures is very important for achieving high‐performance devices. Herein, heterostructures with potential applications in solar harvesting are constructed by CsPb(BrxI1−x)3 perovskite nanocrystals (PNCs) emitting at 640 nm and g‐C3N4 nanosheets (CN) with fluorescence covering from 450 to 550 nm. The fluorescence of CsPb(BrxI1−x)3 PNCs is substantially quenched by CN. Moreover, the photodegradation of CsPb(BrxI1−x)3 is remarkably hastened when interacting with the CN, indicating efficient charge transfer in the heterostructures, which is further verified by time‐resolved photoluminescence (PL) and temperature‐dependent PL results. The charge transfer lifetime is much shorter than the radiative recombination lifetime and defect trapping lifetime, ensuring quick charge transfer from PNCs to CN before radiative recombination and defect trapping, resulting in high charge transfer efficiency up to 98.16%. This work sheds light on heterostructures based on PNCs, which will facilitate their future application in photocatalysts, light‐emitting diodes, and photodetectors.

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“…Further, the lasing mode is analyzed in Figure e. The fwhm of the mode is extracted as δλ ≈ 0.33 nm around 539.6 nm, giving rise to the quality factor up to 1635 according to Q = λ/δλ, which is not only the highest value ever obtained in single-mode quasi-2D perovskite lasers at present , but also among the largest values in 3D perovskite-based lasers assisted by DBRs (Table S1). Further investigation of the dynamics of single-mode lasing was conducted by a streak camera system.…”

Section: Results and Discussionmentioning

confidence: 97%

Subwavelength-Polarized Quasi-Two-Dimensional Perovskite Single-Mode Nanolaser

Liu

et al. 2021

ACS Nano

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When approaching the subwavelength or deep subwavelength scale, there is a fundamental trade-off between the ultimate shrinking size and the performance for miniaturized lasers. Herein, to overcome this trade-off, we investigated the excitonic gain nature of quasi-two-dimensional (quasi-2D) perovskites and revealed that both singlet excitons and polarons would make nearly the entire contribution within ∼50 ps to a high net gain of 558 cm–1. Inspired by the gain characteristic, we successfully shrank the quasi-2D perovskites laser to the subwavelength scale using only a layer of ultraviolet glue and a glass substrate in the vertical dimension. In spite of the compact and simple cavity structure, single-mode lasing with a highly linear polarization degree of 81% and a quality factor of 1635 was achieved. The extremely short cavity, excellent lasing performance, and simple structure of the quasi-2D perovskite laser are expected to provide insights into next-generation integrated laser sources.

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Multicolor Semiconductor Lasers

Cited by 33 publications

References 106 publications

Rational Design of Multi‐Color‐Emissive Carbon Dots in a Single Reaction System by Hydrothermal

Rational Design of Multi‐Color‐Emissive Carbon Dots in a Single Reaction System by Hydrothermal

Highly Efficient Charge Transfer between Perovskite Nanocrystals and g‐C₃N₄ Nanosheets

Subwavelength-Polarized Quasi-Two-Dimensional Perovskite Single-Mode Nanolaser

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Multicolor Semiconductor Lasers

Cited by 33 publications

References 106 publications

Rational Design of Multi‐Color‐Emissive Carbon Dots in a Single Reaction System by Hydrothermal

Rational Design of Multi‐Color‐Emissive Carbon Dots in a Single Reaction System by Hydrothermal

Highly Efficient Charge Transfer between Perovskite Nanocrystals and g‐C3N4 Nanosheets

Subwavelength-Polarized Quasi-Two-Dimensional Perovskite Single-Mode Nanolaser

Contact Info

Product

Resources

About

Highly Efficient Charge Transfer between Perovskite Nanocrystals and g‐C₃N₄ Nanosheets