Key Takeaways & Executive Findings
- •• Cs2B(IV)X6 double perovskites are promising eco-friendly alternatives to lead-based perovskites for optoelectronics. • Recent advances in ion doping, surface coating, and ligand modification have significantly improved their photoluminescence properties. • The review highlights strategies for bandgap engineering and PL optimization to enhance device performance. • Key challenges remain in improving photoluminescence quantum yield and stability, guiding future research directions.
Abstract
The zero-dimensional (0D) ordered lead-free double perovskites (DPs) Cs2B(IV)X6 have recently been recognized as promising candidates in the optoelectronics domain. Their exceptional stability and environmentally benign nature position them as ideal alternatives to their toxic and unstable lead-based halide perovskite counterparts. Recent years have witnessed notable progress in the optical properties of Cs2B(IV)X6, propelled by techniques such as ion doping, surface coating and ligand modification, which has been instrumental in broadening their applications in various optoelectronic domains. Herein, a comprehensive overview is provided on the recent progress regarding synthesis methods, optimization strategies, bandgap engineering, photoluminescence (PL) optimization, and device applications related to Cs2B(IV)X6 materials. It also explores critical aspects including structural diversity, tunable emission, photophysical mechanisms, and material stability. Moreover, the review addresses the prevailing challenges in this field and outlines future research directions aimed at enhancing the photoluminescence quantum yield and stability of Cs2B(IV)X6.
1. Introduction
The inorganic lead-free halide double perovskite (DP) derivatives with a chemical formula of Cs2B(IV)X6 (e.g., Cs2SnCl6, Cs2HfCl6, and Cs2ZrCl6) featuring a vacancy-ordered structure arrangement have emerged as focal points of research across various fields due to their impressive optoelectronic attributes, including a high absorption coefficient, extensive carrier diffusion length, adjustable bandgap, and emission spectrum spanning the entire visible range [1]. The photogenerated charge carriers in these zero-dimensional (0D) perovskites are effectively confined within discrete polyhedral units, enabling efficient charge recombination and luminescence [2]. Consequently, Cs2B(IV)X6 DP is poised as promising alternative to lead-based perovskites for a range of applications, including X-ray scintillators and solid-state lighting, benefiting from their large Stokes shift and lack of toxicity [3, 4].
Unfortunately, due to the presence of a large direct band gap [5], the Cs2B(IV)X6 DP often presents challenges such as lower photoluminescence quantum yield (PLQY), thus constraining its efficacy in high-performance optoelectronic device applications [6]. For example, the excitation energy of Cs2B(IV)X6 DP is excessively high (< 300 nm), significantly impeding the light excitation efficiency of commercial ultraviolet chips and hindering charge injection in electroluminescent devices [7]. Moreover, the presence of
Loading authentic research manuscript (Pages 1–5)...
HU Can, CHEN Qiao-chu, ZENG Guang-sheng, LU Hao-zi, JIANG Tai-jun, CHEN Si-wei, SU Yan, JIANG Ji-zhou, LIU Song, JIANG Jia-liang (2025). Recent progress and prospective of zero-dimensional Cs2B(IV)X6 lead-free double perovskite. Journal of Central South University. https://doi.org/10.1007/s11771-025-6066-4
Research & Educational Purpose Only:The translations, structured abstracts, analytical annotations, and data reports provided by SinoTechIntel are intended exclusively for academic research, internal corporate R&D, and educational benchmarking. They do not constitute formal engineering, chemical safety, legal, or professional advice.
Copyright & Intellectual Property Notice: Original copyright of the underlying source articles and experimental data remains with the respective authors, institutions, and original publishing journals. SinoTechIntel claims intellectual property only over its proprietary translations, analytical syntheses, and AEO structured enhancements in accordance with international fair use and academic citation principles.
Frequently Asked Questions
What are Cs2B(IV)X6 double perovskites?
Cs2B(IV)X6 are zero-dimensional lead-free double perovskites with a vacancy-ordered structure, known for their high stability and eco-friendliness, making them promising alternatives to lead-based perovskites in optoelectronics.
How can the photoluminescence of Cs2B(IV)X6 be optimized?
Recent progress includes ion doping, surface coating, and ligand modification, which have been effective in enhancing photoluminescence quantum yield and tunable emission.
What are the main applications of Cs2B(IV)X6?
They are used in X-ray scintillators, solid-state lighting, and other optoelectronic devices due to their large Stokes shift and non-toxicity.
What challenges remain for Cs2B(IV)X6 materials?
Key challenges include low photoluminescence quantum yield and stability issues, which are being addressed through bandgap engineering and optimization strategies.
Why are Cs2B(IV)X6 considered eco-friendly?
They are lead-free and exhibit exceptional stability, reducing environmental and health concerns compared to traditional lead-based perovskites.
Related Technical Papers & Translations
Direct Repair of the Crystal Structure and Coating Surface of Spent LiFePO4 Materials Enables Superfast Li-Ion Migration
The rapid accumulation of spent LiFePO4 (LFP) cathodes from retired lithium-ion batteries necessitates the development of effective and environmental-friendly recycling strategies. In this context, direct regeneration has emerged as a promising approach for reclaiming LFP cathode materials, offering a streamlined pathway to restore their electrochemical functionality. We report an integrated regeneration protocol that simultaneously repairs the degraded crystal structure and reconstructs the damaged carbon coating in spent LFP. The regenerated cathode material had superfast lithium-ion diffusion kinetics and a stable cathode–electrolyte interface, giving a remarkable rate capability with specific capacities of 122 mAh g−1 at 5C and 106 mAh g−1 at 10C (1C = 170 mA g−1). It also maintained capacities of 110.7 mAh g−1 (5C) and 84.1 mAh g−1 (10C) after 400 cycles. It could be used in harsh environments and could be stably cycled at subzero temperatures (−10 and −20 °C) and in solid-state electrolyte batteries. Life cycle assessment combined with economic evaluation using the EverBatt model reveals that this direct regeneration approach has high economic and environmental benefits.
Oxide Semiconductor for Advanced Memory Architectures: Atomic Layer Deposition, Key Requirement and Challenges
Oxide semiconductors (OSs), introduced by the Hosono group in the early 2000s, have evolved from display backplane materials to promising candidates for advanced memory and logic devices. The exceptionally low leakage current of OSs and compatibility with three-dimensional (3D) architectures have recently sparked renewed interest in their use in semiconductor applications. This review begins by exploring the unique material properties of OSs, which fundamentally originate from their distinct electronic band structure. Subsequently, we focus on atomic layer deposition (ALD), a core technique for growing excellent OS films, covering both basic and advanced processes compatible with 3D scaling. The basic surface reaction mechanisms—adsorption and reaction—and their roles in film growth are introduced. Furthermore, material design strategies, such as cation selection, crystallinity control, anion doping, and heterostructure engineering, are discussed. We also highlight challenges in memory applications, including contact resistance, hydrogen instability, and lack of p-type materials, and discuss the feasibility of ALD-grown OSs as potential solutions. Lastly, we provide an outlook on the role of ALD-grown OSs in memory technologies. This review bridges material fundamentals and device-level requirements, offering a comprehensive perspective on the potential of ALD-driven OSs for next-generation semiconductor memory devices.
Laser powder bed fusion of biodegradable Zn-4Cu alloy: Processing, microstructure and properties
Zn's natural degradability and biocompatibility make it a promising candidate for implants, however, its mechanical properties remain insufficient for bone applications. In this study, the performance of Zn was enhanced by developing Zn-Cu alloys via laser powder bed fusion (LPBF). Optimal LPBF parameters for forming stable tracks were achieved by adjusting laser power and scanning speed. Under optimized conditions of 100 W and 100 mm/s, high-density (99.58%) Zn-Cu alloys with improved hardness (68.2HV) and yield strength (160 MPa) were achieved. These improvements are attributed to solid solution strengthening, segregation strengthening, and grain refinement. The Zn-Cu alloys also demonstrated favorable degradation behavior, with a rate of 0.16 mm/year. This degradation is primarily driven by micro-galvanic corrosion between the CuZn5 phase and Zn matrix, along with refined grains and increased grain boundary density. This work demonstrates a viable strategy for fabricating Zn-based implants with enhanced structural integrity and mechanical performance via LPBF.