Deep-blue Emission Research Articles

High-performance deep-blue electroluminescence from multi-resonance TADF emitters with a spirofluorene-fused double boron framework.

The development of multi-resonance thermally activated delayed fluorescence (MR-TADF) materials in the deep-blue region is highly desirable. A usual approach involves constructing an extended MR-TADF framework; however, it may also intensify aggregate-caused quenching issues and thereby reduce device efficiency. In this study, we develop a molecular design strategy that fuses the MR-TADF skeleton with 9,9'-spirobifluorene (SF) units to create advanced deep-blue emitters. The SF moiety facilitates high-yield one-shot bora-Friedel-Crafts reaction towards an extended skeleton and mitigates interchromophore interactions as a steric group. Our findings reveal that orbital interactions at the fusion site significantly influence the electronic structure, and optimizing the fusion mode allows for the development of emitters with extended conjugation length while maintaining non-bonding character. The proof-of-concept emitter exhibits narrowband emission in the deep-blue region, a near-unity photoluminescence quantum yield, and a fast k RISC of 2.4 × 105 s-1. These exceptional properties enable the corresponding sensitizer-free OLED to achieve a maximum external quantum efficiency (EQEmax) of 39.0% and Commission Internationale de l'Eclairage (CIE) coordinates of (0.13, 0.09). Furthermore, the hyperfluorescence device realizes an EQEmax of 40.4% with very low efficiency roll-off.

Acceptor modification of diindolocarbazole embedded multiple-resonance emitters for efficient narrowband deep-blue OLEDs with CIEy ≤ 0.08 and alleviated efficiency roll-off

We designed and synthesized two efficient narrowband deep-blue emitters, pICz-PPO and pICz-2PPO, via an acceptor modification strategy to optimize the charge carrier mobility and thus addressed the efficiency roll-off issue.

Two-dimensional Cs3Sb2Br9 inducing transformation of three-dimensional CsPbBr3 to nanoplates.

This communication describes an effective morphological control strategy involving introducing two-dimensional (2D) Cs3Sb2Br9 to induce a transformation of three-dimensional (3D) CsPbBr3 to 2D nanoplates (NPLs). By tuning the Sb/Pb ratio, 2D CsPbBr3 NPLs exhibiting a deep-blue emission centered at a wavelength of 464 nm with an FWHM of 24 nm have been produced. The absence of organic ligands in these high-quality 2D NPLs mitigate the instability issue induced by organic ligand migration and penetration, and these NPLs exhibit 80% of the initial PL intensity after 55 days.

Deep-blue narrow-band emissive cesium europium bromide perovskite nanocrystals with record high emission efficiency for wide-color-gamut backlight displays.

Lead halide perovskite nanocrystals (NCs) are highly promising for backlighting display applications due to their high photoluminescence quantum yields (PLQYs) and wide color gamut values. However, the practical applications of blue emitters are limited due to the toxicity of lead, unstable structure, and unsatisfactory PLQY. Herein, we report the successful synthesis of divalent europium-based perovskite CsEuBr3 NCs using a modified hot injection method. By optimizing the reaction conditions, the CsEuBr3 NCs display a deep-blue emission at 443 nm with a full width at half maximum (FWHM) of 28.5 nm, a color purity of 99.61%, and a record high PLQY of 93.51% for deep-blue narrow-band emissive lead-free perovskite NCs as far as we know. The emission mechanism of CsEuBr3 NCs is proved through first-principles calculations and spectral analysis. Notably, the CsEuBr3 NCs exhibit remarkable stability when exposed to high temperature, UV irradiation, and long-term sealed storage. The incorporation of CsEuBr3 NCs into polydimethylsiloxane (PDMS) serving as a converter is utilized for white light-emitting devices (WLEDs). WLEDs for backlight displays achieves a wide color gamut of 127.1% of the National Television System Committee standard (NTSC), 94.9% coverage of the ITU-R Recommendation BT.2020 (Rec.2020), and their half-lifetime is up to 1677 h, providing a promising pathway for highly efficient, environment-friendly and practical liquid crystal display backlights.

Enhanced chiroptical activity for narrow deep-blue emission in axial chiral frameworks via three-dimensional interlocking.

The advancement of desirable circularly polarized luminescence (CPL) emitters is predominantly constrained by the effective regulation of magnetic and electric transition vectors, particularly within the deep-blue spectral domain. Herein, we present four pairs of novel chiral emitters with systematically varied molecular rigidity, symmetry, and chiral centers to elucidate the intrinsic coupling of key molecular parameters influencing their chiroptical properties. Notably, the incorporation of appropriate intramolecular 3D-interlocking within a natural binaphthyl chirality skeleton offers an effective approach to achieving both significantly narrowed full width at half maximum (FWHM, as low as 18 nm) and substantially enhanced chiroptical activity (luminous dissymmetry factor, g PL, up to 3.0 × 10-3). Additionally, introducing a secondary chiral center closely parallel to the primary chiral plane facilitates strong chiral-chiral interactions, further affording a 50% improvement in their g PL values. As a demonstration, vacuum-deposited circularly polarized organic light-emitting diodes incorporating these pure fluorescent emitters exhibit outstanding electroluminescent performance, with maximum external quantum efficiency exceeding 5.35%, favorable FWHM of approximately 25 nm, and extreme CIE y values below 0.03.

An Ideal Molecular Construction Strategy for Ultra-Narrow-Band Deep-Blue Emitters: Balancing Bathochromic-Shift Emission, Spectral Narrowing, and Aggregation Suppression.

Narrowband emissive multiple resonance (MR) emitters promise high efficiency and stability in deep-blue organic light-emitting diodes (OLEDs). However, the construction of ideal ultra-narrow-band deep-blue MR emitters still faces formidable challenges, especially in balancing bathochromic-shift emission, spectral narrowing, and aggregation suppression. Here, DICz is chosen, which possesses the smallest full-width-at-half-maximum (FWHM) in MR structures, as the core and solved the above issue by tuning its peripheral substitution sites. The 1-substituted molecule Cz-DICz is able to show a bright deep-blue emission with a peak at 457nm, an extremely small FWHM of 14nm, and a CIE coordinate of (0.14, 0.08) in solution. The corresponding OLEDs exhibit high maximum external quantum efficiencies of 22.1%-25.6% and identical small FWHMs of 18nm over the practical mass-production concentration range (1-4 wt.%). To the best of the knowledge, 14 and 18nm are currently the smallest FWHM values for deep-blue MR emitters with similar emission maxima under photoluminescence and electroluminescence conditions, respectively. These discoveries will help drive the development of high-performance narrowband deep-blue emitters and bring about a revolution in OLED industry.

Surface functionalized graphene oxide integrated 9,9-diethyl-9H-fluoren-2-amine monohybrid nanostructure: Synthesis, physicochemical, thermal and theoretical approach towards optoelectronics

The fields of energy materials, water purification, environmental protection, catalysis and biomedical technology are greatly promoted by the usage of graphene oxide (GO) and its functionalized derivatives. Among them, the application of functionalized GO in lightning has recently drawn growing attention towards optoelectronics. In the current study, designed and synthesized a 9,9-diethyl-9H-fluoren-2-amine (FA) functionalized with GO by using CDI catalyst results, FA modified graphene oxide (FA-GO) monohybrid. The structural characterization was made with the help of FTIR and Raman spectroscopy; and explored their thermal decomposition temperature (>150 °C). Further, the optical characteristics of UV–visible and photoluminescence (PL) indicate the absorption and emission of FA-GO are ∼314 nm and ∼420 nm, respectively. The calculated CIE color coordinates found to be better in thin film at deep blue emission, are x = 0.158, y = 0.023 (0.1 % PMMA matrix). The FA-GO monohybrid exhibits a striking improvement in PL caused by surface passivation and excited-state intramolecular proton transfer. In addition, density functional theory calculations are used to analyse the stability of the designed structure and its interlayer separation. The results of the highest occupied molecular orbital (HOMO) and lowest unoccupied molecular orbital (LUMO) energy levels are −6.357 eV and −2.286 eV respectively with the energy gap ΔE = 4.071 eV. In addition, the FMOs excel in evaluating various chemical reactivity descriptors such as electronegativity (χ = 4.3215), global hardness (η = 2.0355), softness (δ = 0.4913) and electrophilicity (ω = 4.5874). Furthermore, a high dipole moment value of 9.133 Debye of FA-GO ensures a strong intramolecular interaction. These evolutions help to improve the optical properties based on amine-functionalized GO. The outcomes, directing an approach to the development of graphene-based materials for blue lightning applications.

Hydrogen bond boosts EQEs to 30+% for acridone-carbazole based deep-blue TADF emitters in simple-structure OLEDs

A group of D-A-D type thermally activated delayed fluorescence (TADF) emitters were developed with 10-(pyridin-2-yl)acridin-9(10H)-one as acceptor and substituted carbazoles as donors. The design was focused on incorporating pyridyl to the 10-site nitrogen atom of acridin-9(10H)-one ring, which improved the reverse intersystem crossing rate constant kRISC from 103 s−1 to 105 s−1. More importantly, the linkage of pyridyl uniquely from its 2-position to acridin-9(10H)-one ring induced intramolecular hydrogen bond, which suppressed nonradiative transition rates by three to four orders of magnitude and universally increased the photoluminescence quantum yields from 54 % to nearly 100 %. In combination with the intrinsic high horizontal orientation ratios over 90 % of acridin-9(10H)-one based molecules, such pyridyl decoration boosted the external quantum efficiencies of simple-structure deep blue organic light-emitting diodes to 31–33 % with CIEx of 0.15 and CIEy of 0.09 ∼ 0.12, being double of that for hydrogen-bond-free parent emitter and representing the state-of-the-art efficiencies for the deep blue twisted intramolecular charge transfer type TADF materials with CIEy ≤ 0.10 so far. These TADF emitters are comparable with the prevailing multiresonance blue emitters in terms of distinctive efficiencies, but advantageous in much facile syntheses.

Efficient deep blue fluorescent emitters based on bipolar phenanthroimidazole-carbazole hybrid for non-doped electroluminescent device with small CIEy

In this work, four bipolar deep-blue emitting materials of 2-(4-(9H-carbazol-9-yl)phenyl)-1-(4-methylphenyl)-1H-phenanthro[9,10-d]imidazole (MePPIM-Cz), 2-(4-(9H-carbazol-9-yl)phenyl)-1-(4-chlorophenyl)-1H-phenanthro [9,10-d]imidazole (ClPPIM-Cz), 2-(4-(9H-carbazol-9-yl)phenyl)-1-(4-tert-butyl phenyl)-1H-phenanthro[9,10-d]imidazole (BuPPIM-Cz) and 2-(4-(9H-carbazol-9-yl) phenyl)-1-(4-(trifluoromethyl)phenyl)-1H-phenanthro[9,10-d]imidazole (TFMPPIM-Cz) based on phenanthroimidazole and carbazole group have been designed and synthesized by introducing different electron active substitutions into the N1 position of phenanthroimidazole. The thermal, photophysical, electrochemical and computational properties of four compounds were investigated. All compounds exhibited the deep blue emission and good thermal stability with glass transition temperature (Tg) in range of 126°C–137 °C. Single carrier devices were also fabricated and demonstrated that the four compounds have bipolar transporting properties. The non-doped organic light emitting diodes (OLEDs) based on MePPIM-Cz, ClPPIM-Cz, BuPPIM-Cz and TFMPPIM-Cz showed deep blue emission with the Commission Internationale de L'Eclairage (CIE) coordinates of (0.16, 0.07), (0.16, 0.06), (0.16, 0.05) and (0.16, 0.10) and the maximum external quantum efficiencies (EQEmax) of 2.67%, 2.24%, 1.81% and 1.09%, respectively. The CIE coordinates of MePPIM-Cz, ClPPIM-Cz and BuPPIM-Cz is extremely close to the National Television System Committee (NTSC) standard blue CIE of (0.14, 0.08), which is very significant for high color purity full-color display.

Synthesis of Unsymmetrically Substituted [5]Helicenes by Tandem Arylation of Binaphthyl by Suzuki Coupling and C−H Activation

AbstractWe report a step‐efficient approach for the synthesis of unsymmetrically substituted naphtho[1,2‐g]chrysenes by tandem arylation of 2,2’‐diiodo‐1,1’‐binaphthyl with arylboronic acids, which proceeds through Suzuki coupling followed by intramolecular arylation by C−H activation. Substrate screening examining over 30 meta‐ and/or para‐substituted arylboronic acids showed that this approach provides the desired helicene products most effectively if arylboronic acids have a small acidifying group at the meta‐position. In the case of unsymmetrically substituted arylboronic acids, the regioselectivity of C−H activation is directed by the attached group(s), its effect on the C−H acidity of the adjacent position, its coordination ability, as well as steric hindrance. Interestingly, selected [5]helicenes exhibited attractive deep blue emission with fluorescence lifetimes slightly exceeding 10 ns.

Naptha-phenanthroimidazole-based blue fluorophores (y

Organic light-emitting diodes are a promising new technology for next-generation displays and lighting applications, particularly in the quest for efficient deep blue fluorophores (y= < 0.05). Despite the receipt of several reports, it remains imperative to advance the development of a deep blue emitter that can address solubility, stability, color purity, and efficiency. Eye on these challenges, herein, four new blue phenanthroimidazole and naphthalene-based derivatives, 2-(naphthalen-1-yl)-1H-phenanthro[9,10-d]imidazole(Pq-NH-NA), 2-(naphthalen-1-yl)-1-phenyl-1H phenanthro [9,10-d]imidazole (Pq-An-NA), 2-(naphthalen-1-yl)-1-(3-(trifluoromethyl)phenyl)-1H-phenanthro[9,10-d]imidazole (Pq-mF-NA), and 2-(naphthalen-1-yl)-1-(4-(trifluoromethyl)phenyl)-1H-phenanthro[9,10-d]imidazole (Pq-pF-NA) were designed and synthesized. Further, the PI molecules were structurally characterized by spectroscopic analysis, and their thermal decomposition (Td) is found to be 203–309 °C. Substitution at the N1 position of imidazole provides a facile alternative role for photophysical and electronic properties. The PI fluorophores were further characterized in solution, thin-film, and solid where the solid results are enhanced in terms of intense color emission (x = 0.158, y = 0.037). It showed a good quantum yield of 14.28 % in solution and 19.33 % in solid, indicating that fluorinated molecules lead to better performance than the rest of them. Additionally, the InGaN LED fabricated with the fluorinated molecule Pq-pF-NA emitted 425 nm with a deep blue emission and yielding CIE color coordinates (x = 0.154, y = 0.048). The film study also revealed the deep blue emission with increasing concentration of emitter (2.5 %). The observed results apprise that the synthesized fluorophores are efficient to deep blue emitters and capable candidates for organic light-emitting diodes.

Creation of High-Quality Deep-Blue AIE Emitter with a Crossed Long-Short Axis Structure for Efficient and Versatile OLEDs.

Developing deep-blue emitters for organic light-emitting diodes (OLEDs) is critical but challenging, which requires a good balance between light color, exciton utilization, and photoluminescence quantum yield (PLQY) of solid film. Herein, a high-quality deep-blue emitter, abbreviated 2TriPE-CzMCN, is designed by introducing an aggregation-induced emission (AIE) group into a crossed long-short axis (CLSA) skeleton. Theoretical and experimental investigations reveal that the CLSA molecular design can achieve a balance between deep-blue emission and triplet-excitons utilization, while the high PLQY of the solid film resulting from the AIE feature helps to improve the performance of OLEDs. Consequently, when 2TriPE-CzMCN is used as the emitting dopant, the OLED exhibits a deep-blue emission at 430nm with a record-high maximum external quantum efficiency (EQE) of 8.84%. When 2TriPE-CzMCN serves as the host material, the sensitized monochrome orange and two-color white OLEDs (WOLEDs) realize high EL performances that exceed the efficiency limit of conventional fluorescent OLEDs. Moreover, high-performance three-color WOLEDs with a color rendering index (CRI) exceeding 90 and EQE up to 18.08% are achieved by using 2TriPE-CzMCN as the blue-emitting source. This work demonstrates that endowing CLSA molecule with AIE feature is an effective strategy for developing high-quality deep-blue emitters, and high-performance versatile OLEDs can be realized through rational device engineering.

Stable Spiro‐Linked Terfluorenes with Triphenylamine Pendants as Deep Blue Emitters for Solution‐Processed Organic Light‐Emitting Diodes

AbstractHerein, we reported new spiro‐linked terfluorenes (TF1 and TF2) as solution‐processible hole‐transporting‐free deep‐blue fluorescent emitters for simple structured organic light‐emitting diodes (OLEDs). They were designed and synthesized by incorporating triphenylamine pendants into the C9 positions of the spiro‐linked terfluorene, resulting in a criss‐cross configuration of the two terfluorene backbones and a highly bulky molecular geometry from the pendant groups. Consequently, TF1 and TF2 exhibited good quality thin films by spin‐coating, stable deep blue emissions with no unwanted long wavelength emission after prolonged thermal annealing and UV exposure, shallow highest occupied molecular orbital energy levels (−5.36–−5.37 eV), decent hole mobilities (1.09–1.23×10−7 cm2 V−1 s−1), and high thermal stability, and effectively employed as non‐doped emissive layers in the OLEDs. Particularly, TF2‐based solution‐processed OLED displayed a bright deep blue emission with superior EL performance (turn‐on voltage (Von) of 3.4 V, external quantum efficiency (EQEmax) of 3.82 %, and luminance efficiency (LEmax) of 5.22 cd A−1). This outstanding EL performance of the non‐doped solution‐processed deep blue OLED could be attributed to the effective molecular design, and this work presented a new approach for constructing effective blue emitters based on oligofluorenes.

A High-Efficiency Deep Blue Emitter for OLEDs with a New Dual-Core Structure Incorporating ETL Characteristics.

In this study, we introduced the weak electron-accepting oxazole derivative 4,5-diphenyl-2-(4-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)phenyl)oxazole (TPO) into both anthracene and pyrene moieties of a dual core structure. Ultimately, we developed 2-(4-(6-(anthracen-9-yl)pyren-1-yl)phenyl)-4,5-diphenyloxazole (AP-TPO) as the substitution on the second core, pyrene, and 4,5-diphenyl-2-(4-(10-(pyren-1-yl)anthracen-9-yl)phenyl)oxazole (TPO-AP) as the substitution on the first core, anthracene. Both materials exhibited maximum photoluminescence wavelengths at 433 and 443 nm in solution and emitted deep blue light with high photoluminescence quantum yields of 82% and 88%, respectively. When used as the emitting layer in non-doped devices, TPO-AP outperformed AP-TPO, achieving a current efficiency of 5.49 cd/A and an external quantum efficiency of 4.26% in electroluminescence. These materials introduce a new category of deep blue emitters in the organic light-emitting diodes field, combining characteristics related to the electron transport layer.

Efficient narrowband deep-blue emission from carbazole-grafted diindolophenazine fluorophores

Efficient narrowband deep-blue emission from carbazole-grafted diindolophenazine fluorophores

Temperature response TADF/ RTP dual mode afterglow of carbon dots and flake C3N4 composites for information encryption and advanced lighting

TADF emission based on CD materials has inspired extensive attention in recent years. Herein, CD composites with afterglow color temperature-responsive were prepared by confining BCDs/ BPCDs in a g-C3N4 matrix. The covalent bonds extensively protect the triplet states and promote the ISC process, and the small △EST is sufficient to encourage the RISC process. At room temperature, the BCD composite exhibits a deep blue TADF emission, and the BPCD composite shows two TADF emission peaks in the blue-green region. BCD/ BPCD composites exhibit RTP emission at lower temperatures, and the competition between TADF and RTP leads to the color temperature-responsive properties in these composites. A simple concept of information encryption was developed to demonstrate the great potential of these composites in advanced security applications. Based on the high overall quantum yields (44 %) and broad full width at half maximum (over 140 nm) at the visible region of the BPCD composites, they are successfully applied to develop the single component fluorescence/ TADF dual-emission delay WLED with CIE coordinates and CRI of (0.32, 0.34) and 92. This work provides a new strategy for producing CDs-based TADF materials and may motivate CDs TADF materials applied in information encryption and advanced lighting application.

Metal Halide Single Crystals RbCdCl3:Sn2+ and Rb3SnCl7 with Blue and White Emission Obtained via a Hydrothermal Process.

Until now, effective blue light-emitting materials are essentially needed for the creation of white light and precise color renderings in real-world applications, but the efficiency of blue light-emitting materials has lagged far behind. Here, we present a hydrothermal method to synthesize tin-based metal halide single crystals (RbCdCl3:Sn2+ and Rb3SnCl7). Two single crystal materials with different shapes and phases can simultaneously be synthesized in the same stoichiometric ratio. Rb3SnCl7 has a bulk shape, while RbCdCl3:Sn2+ has a needle shape. The deep blue emission (436 nm) of RbCdCl3:Sn2+ can be obtained under the optimal excitation wavelength irradiation. However, pure blue emission (460 nm) to white light can be obtained by changing the excitation wavelength in Rb3SnCl7. The refinement spectra of the electronic structures of RbCdCl3:Sn2+ and Rb3SnCl7 are investigated by density functional theory. It is concluded that the difference in the distribution of Cl energy states leads to the existence of Cl local defect states, which is the reason for the rich luminescence of the two single crystals. These findings provide a path for realizing single-phase broadband white-emitting materials.

Gallium Sulfide Quantum Dots with Zinc Sulfide and Alumina Shells Showing Efficient Deep Blue Emission.

Solution-processed quantum dot (QD) based blue emitters are of paramount importance in the field of optoelectronics. Despite large research efforts, examples of efficient deep blue/near UV-emitting QDs remain rare due to lack of luminescent wide band gap materials and high defect densities in the existing ones. Here, we introduce a novel type of QDs based on heavy metal free gallium sulfide (Ga2 S3 ) and their core/shell heterostructures Ga2 S3 /ZnS as well as Ga2 S3 /ZnS/Al2 O3 . The photoluminescence (PL) properties of core Ga2 S3 QDs exhibit various decay pathways due to intrinsic defects, resulting in a broad overall PL spectrum. We show that the overgrowth of the Ga2 S3 core QDs with a ZnS shell results in the suppression of the intrinsic defect-mediated states leading to efficient deep-blue emission at 400 nm. Passivation of the core/shell structure with amorphous alumina yields a further enhancement of the PL quantum yield approaching 50 % and leads to an excellent optical and colloidal stability. Finally, we develop a strategy for the aqueous phase transfer of the obtained QDs retaining 80 % of the initial fluorescence intensity.

Expanded multiple-resonance structure for highly efficient narrowband deep-blue organic light-emitting diodes

Excellent color purity and high external quantum efficiency (EQE) are major requirements in the development of deep-blue organic light-emitting diodes (OLEDs). To achieve this, multiple-resonance (MR)–thermally activated delayed fluorescence (TADF) emitters have been considered as promising options. Herein, we suggest a novel expanded MR design strategy to fabricate deep-blue MR–TADF emitters derived from a fused indolo[3,2,1-jk]carbazole framework. The expanded MR structure managed a triplet excited state for the accelerated spin–vibronic coupling-assisted reverse intersystem crossing and increased the emission dipole orientation while maintaining the high efficiency and deep-blue emission color. The rigid and planar structure of the MR core yielded a small full-width at half-maximum (FWHM; less than 16 nm), high photoluminescence quantum yield (over 97%), and high horizontal emitting dipole orientation (over 90%), and facilitated a second-order spin–vibronic coupling-assisted triplet-to-singlet spin crossover. The fabricated MR–TADF OLEDs recorded a high EQE of 24.3% and FWHM of 21 nm at a CIEy of 0.044, thereby satisfying the BT.2020 blue standard. Additionally, further optimized device architecture provided an EQE of 26.8%.

Regulating Phase Distribution of Dion-Jacobson Perovskite Colloidal Multiple Quantum Wells Toward Highly Stable Deep-Blue Emission.

Metal halide perovskite colloidal quantum wells (CQWs) hold great promise for modern photonics and optoelectronics. However, current studies focus on Ruddlesden-Popper (R-P) phase perovskite CQWs that contain bilayers of monovalent long-chain alkylamomoniums between the separated perovskite octahedra layers. The bilayers are packed back-to-back via weak van der Waals interaction, resulting in inferior charge carrier transport and easier decomposition of perovskite. This report first creates a new type of perovskite colloidal multiple QWs (CMQWs) in the form of Dion-Jacobson (D-J) structure by introducing an asymmetric diammonium cation. Furthermore, the phase distribution is optimized by the synergistic effect of valeric acid and zwitterionic lecithin, finally achieving pure deep-blue emission at 435nm with narrow full width at half maximum. The diammonium layer in D-J perovskite CMQWs features extremely short width of only ≈0.6nm, thereby contributing to more effective charge carrier transport and higher stability. Through the continuous photoluminescence (PL) measurement and corresponding theoretical calculation, the higher stability of D-J perovskite CMQWs than that of R-P structural CMQWs is confirmed. This work reveals the inherent superior stability of D-J structural CMQWs, which opens a new direction for fabricating stable perovskite optoelectronics.