Centimeter‐Sized Cs4PbBr6 Crystals with Embedded CsPbBr3 Nanocrystals Showing Superior Photoluminescence: Nonstoichiometry Induced Transformation and Light‐Emitting Applications

• Published in: Advanced functional materials 2018-04, Vol.28 (16), p.n/a
• Main Authors: Chen, Xiaomei, Zhang, Feng, Ge, Yong, Shi, Lifu, Huang, Sheng, Tang, Jialun, Lv, Zhao, Zhang, Li, Zou, Bingsuo, Zhong, Haizheng
• Format: Article
• Language: English
• Subjects: Backlights; Color; Cs4PbBr6; Efficiency; Emitters; Gallium nitrides; light‐emitting diodes; Liquid crystal displays; Materials science; Nanocrystals; nanocrystals (NCs); perovskite; Photoluminescence; White light
• ISSN: 1616-301X; 1616-3028
• DOI: 10.1002/adfm.201706567

An HBr‐assisted slow cooling method is developed for the growth of centimeter‐sized Cs4PbBr6 crystals. The obtained crystals show strong green photoluminescence with absolute photoluminescence quantum yields up to 97%. More importantly, the evolution process and structural characterizations support that the nonstoichiometry of initial Cs4PbBr6 crystals induce the formation of nanosized CsPbBr3 nanocrystals in crystalline Cs4PbBr6 matrices. Furthermore, high efficiency and wide color gamut prototype white light‐emitting diode devices are also demonstrated by combining the highly luminescent Cs4PbBr6 crystals as green emitters and commercial K2SiF6:Mn4+ phosphor as red emitters with blue emitting GaN chips. The optimized devices generate high‐quality white light with luminous efficiency of ≈151 lm W−1 and color gamut of 90.6% Rec. 2020 at 20 mA, which is much better than that based on conventional perovskite nanocrystals. The combination of improved efficiency and better stability with comparable color quality provides an alternative choice for liquid crystal display backlights. Centimeter‐sized Cs4PbBr6 crystals with embedded CsPbBr3 NCs are fabricated through an HBr‐assisted slow cooling technique, achieving a photoluminescence quantum yield about 97%. The formation can be explained by the nonstoichiometry induced partial transformation from defective Cs4PbBr6 crystals. Furthermore, a luminous efficiency up to 151 lm W−1 with a color gamut of 90.6% of Rec. 2020 is achieved, showing the bright future for display backlights.