Highly emissive and color-tunable copper-based halide composites for bright white light-emitting diodes

Zhang, Huanhuan; Yang, Lin; Chen, Hao; Ma, Wenqiang; Wang, Teng

doi:10.1039/d2qm00172a

Cited by 8 publications

(14 citation statements)

References 52 publications

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“…[12,44] In addition, the relatively low PLQY in 1D CsCu 2 I 3 was previously attributed to the high de-trapping rate of STEs. [45,46] Our experimental evidence suggests that in both the 1D CsCu 2 I 3 and 0D Cs 3 Cu 2 I 5 materials, the effect of de-trapping is relatively negligible. We suggest that the PLQY is largely affected by the E AD that has significant influence on the nonradiative recombination of STEs.…”

Section: Effects Of Barrierless Ste Formation and Large Exciton Self-...mentioning

confidence: 91%

Barrierless Exciton Self‐Trapping and Emission Mechanism in Low‐Dimensional Copper Halides

Xing

Zhou

Zhong

et al. 2022

Adv Funct Materials

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Low-dimensional copper halides having nontoxic elements are attracting increasing attention for their peculiar emission properties. Self-trapped excitons (STEs) account for their high photoluminescence quantum yields (PLQYs) with emission that can stretch across the entire visible spectrum. However, intrinsic factors that influence the formation or loss of the emissive species in low-dimensional copper halides remain elusive. Here, a comprehensive study on the STE formation dynamics of one-dimensional CsCu 2 I 3 and zero-dimensional Cs 3 Cu 2 I 5 is presented. It is found from STE kinetic analysis that a slower STE formation demonstrated by the 1D structure is not hindered by a potential barrier, but instead related to the number of phonons released in the self-trapping process. It is further revealed that in 1D CsCu 2 I 3 , the non-radiative recombination of STEs mainly occurs via the intersection between the STE state and the ground state in the configuration coordinate diagram, placing an intrinsic limit on the PLQY at room temperature. These findings show that the STE formation is affected by both the self-trapping depth and the phonon energy as opposed to a potential barrier in low-dimensional copper halides. The better understanding of STE formation and recombination processes provide basis for improving design and performance for broadband light emitting devices.

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Section: Effects Of Barrierless Ste Formation and Large Exciton Self-...mentioning

confidence: 91%

Barrierless Exciton Self‐Trapping and Emission Mechanism in Low‐Dimensional Copper Halides

Xing

Zhou

Zhong

et al. 2022

Adv Funct Materials

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“…Therefore, such component regulation tactics of the cesium copper iodine compounds offers a controllable and practical strategy for realizing white light tuning, making it possible to meet daily variations in sunlight. [122,192,194,203] Despite the great progress in TCHs-based WLEDs, they are still in the initial stage with far more works anticipated to further enhance their performance. Table 2 summarizes the device performance parameters of WLEDs from TCH emitters.…”

Section: Phosphor-converted Wledsmentioning

confidence: 99%

“…Chemical transformation is an interesting phenomenon and an effective way for regulating the optical properties of materials. [ 202–204 ] Shi's group observed the PL spectrum regulation of TCHs and achieved the reversible phase transition between yellow‐emitting CsCu 2 I 3 and blue‐emitting Cs 3 Cu 2 I 5 . [ 202 ] Specifically, when CsI or CuI was added into the halide products, Cs 3 Cu 2 I 5 reacts with CuI to form CsCu 2 I 3 ; CsCu 2 I 3 can be converted to Cs 3 Cu 2 I 5 by reacting with CsI.…”

Section: Luminescence Regulation Of Tchsmentioning

confidence: 99%

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Recent Advances and Opportunities of Eco‐Friendly Ternary Copper Halides: A New Superstar in Optoelectronic Applications

Lin

et al. 2023

Advanced Materials

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Recently, the newly‐emerging lead‐free metal‐halide materials with less toxicity and superior optoelectronic properties have received wide attention as the safer and potentially more robust alternatives to lead‐based perovskite counterparts. Among them, ternary copper halides (TCHs) have become a vital group due to their unique features, including abundant structural diversity, ease of synthesis, unprecedented optoelectronic properties, high abundance, and low cost. Although the recent efforts in this field have made certain progresses, some scientific and technological issues still remain unresolved. Herein, a comprehensive and up‐to‐date overview of recent progress on the fundamental characteristics of TCH materials and their versatile applications is presented, which contains topics such as: i) crystal and electronic structure features and synthesis strategies; ii) mechanisms of self‐trapped excitons, luminescence regulation, and environmental stability; and iii) their burgeoning optoelectronic devices of phosphor‐converted white light‐emitting diodes (WLEDs), electroluminescent LEDs, anti‐counterfeiting, X‐ray scintillators, photodetectors, sensors, and memristors. Finally, the current challenges together with future perspectives on the development of TCH materials and applications are also critically described, which is considered to be critical for accelerating the commercialization of these rapidly evolving technologies.

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“…[22,23] The other is the multi-component strategy, namely combining multi-components with different emission regions, such as (Cu−Ga−S, CGS)/ZnS core/shell quantum dots, CdSe/ZnS quantum dots, 𝛼-CsPbI 3 /𝛿-CsPbI 3 , CsCu 2 I 3 @Cs 3 Cu 2 I 5 and so on. [24][25][26][27][28][29][30][31][32] It exhibits good color rendering due to its wide color gamut. Recently, the multi-component composites based on different copper(I)-based halide perovskites have attracted significant attention due to their bright selftrapped excitons (STEs) emission, high CRI, and tunable emission from cold to warm white light.…”

Section: Introductionmentioning

confidence: 99%

High‐Performance White Emission from Cu‐Based Perovskite Compound

Zhang,

Chu,

Jiang

et al. 2024

Advanced Optical Materials

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The white emissions based on lead‐free perovskites with broadband emission due to self‐trapped excitons (STEs) are considered as an ideal candidate for next‐generation white light‐emitting diodes (WLEDs). Recently, copper‐based halide perovskites Cs3Cu2I5@CsCu2I3 composites films with a high color‐rendering index (CRI) have been developed for WLEDs. However, the Cs3Cu2I5@CsCu2I3 composites generally exhibit a relatively low photoluminescence quantum yield (PLQY). Herein, a high PLQY up to 86.75% copper‐based perovskite Gua3Cu2I5 (Gua = guanidine) films with a broadband strong yellow STEs emission centered at 544 nm is synthesized. By combining with efficient blue STEs emission Cs3Cu2I5 component via composition engineering of Cs3Cu2I5@Gua3Cu2I5, a high PLQY of up to 96.1% is achieved on the white emission composites films. Moreover, a high CRI of 93 WLEDs is achieved by integrating Cs3Cu2I5@Gua3Cu2I5 composites film onto a UV LED chip. These findings provide a simple and effective strategy for designing highly efficient white light‐emitting diodes.

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Highly emissive and color-tunable copper-based halide composites for bright white light-emitting diodes

Abstract: Lead-free metal halides have gained considerable attention due to their excellent optoelectronic properties, however, the direct synthesis of white light sources remains a challenge for developing high-performance white light-emitting diodes...

Cited by 8 publications

References 52 publications

Barrierless Exciton Self‐Trapping and Emission Mechanism in Low‐Dimensional Copper Halides

Barrierless Exciton Self‐Trapping and Emission Mechanism in Low‐Dimensional Copper Halides

Recent Advances and Opportunities of Eco‐Friendly Ternary Copper Halides: A New Superstar in Optoelectronic Applications

High‐Performance White Emission from Cu‐Based Perovskite Compound

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