Highly stable CsPbBr3 quantum dots coated with alkyl phosphate for white light-emitting diodes

Tongtong Xuan; Xianfeng Yang; Sunqi Lou; Junjian Huang; Yong Liu; Jinbo Yu; Huili Li; Ka-Leung Wong; Chengxin Wang; Jing Wang

doi:10.1039/c7nr04179a

Highly stable CsPbBr₃ quantum dots coated with alkyl phosphate for white light-emitting diodes

Tongtong Xuan, Xianfeng Yang, Sunqi Lou, Junjian Huang, Yong Liu, Jinbo Yu, Huili Li, Ka-Leung Wong, Chengxin Wang, Jing Wang

Research output: Journal Publications and Reviews › RGC 21 - Publication in refereed journal › peer-review

263 Citations (Scopus)

Abstract

Inorganic halide perovskite quantum dots (QDs) suffer from problems related to poor water stability and poor thermal stability. Here we developed a simple strategy to synthesize alkyl phosphate (TDPA) coated CsPbBr₃ QDs by using 1-tetradecylphosphonic acid both as the ligand for the CsPbBr₃ QDs and as the precursor for the formation of alkyl phosphate. These QDs not only retain a high photoluminescence quantum yield (PLQY, 68%) and narrow band emission (FHWM ∼ 22 nm) but also exhibit high stability against water and heat. The relative PL intensity of the QDs was maintained at 75% or 59% after being dispersed in water for 5 h or heated to 375 K (100 °C), respectively. Finally, white light-emitting diodes (WLEDs) with a high luminous efficiency of 63 lm W^-1 and a wide color gamut (122% of NTSC) were fabricated by using green-emitting CsPbBr₃/TDPA QDs and red-emitting K₂SiF₆:Mn⁴⁺ phosphors as color converters. The luminous efficiency of the WLEDs remained at 90% after working under a relative humidity (RH) of 60% for 15 h, thereby showing promise for use as backlight devices in LCDs. © 2017 The Royal Society of Chemistry.

Original language	English
Pages (from-to)	15286-15290
Journal	Nanoscale
Volume	9
Issue number	40
DOIs	https://doi.org/10.1039/c7nr04179a
Publication status	Published - 28 Oct 2017
Externally published	Yes

Bibliographical note

Publication details (e.g. title, author(s), publication statuses and dates) are captured on an “AS IS” and “AS AVAILABLE” basis at the time of record harvesting from the data source. Suggestions for further amendments or supplementary information can be sent to [email protected].

Funding

The authors appreciate the financial support from the National Natural Science Foundation of China (no. 51702373, 51572302 and 51472087), “973” programs (2014CB643801), Teamwork Projects of Guangdong Natural Science Foundation (S2013030012842), the Guangdong Provincial Science & Technology Project (2017A050501008, 2015B090926011 and 2013B090800019), the Natural Science Foundation of Guangdong Province (2014A030313114), New Faculty Start-up funding in the South China University of Technology (SCUT), and the Fundamental Research Funds for the Central Universities from SCUT.

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title = "Highly stable CsPbBr3 quantum dots coated with alkyl phosphate for white light-emitting diodes",

abstract = "Inorganic halide perovskite quantum dots (QDs) suffer from problems related to poor water stability and poor thermal stability. Here we developed a simple strategy to synthesize alkyl phosphate (TDPA) coated CsPbBr3 QDs by using 1-tetradecylphosphonic acid both as the ligand for the CsPbBr3 QDs and as the precursor for the formation of alkyl phosphate. These QDs not only retain a high photoluminescence quantum yield (PLQY, 68%) and narrow band emission (FHWM ∼ 22 nm) but also exhibit high stability against water and heat. The relative PL intensity of the QDs was maintained at 75% or 59% after being dispersed in water for 5 h or heated to 375 K (100 °C), respectively. Finally, white light-emitting diodes (WLEDs) with a high luminous efficiency of 63 lm W-1 and a wide color gamut (122% of NTSC) were fabricated by using green-emitting CsPbBr3/TDPA QDs and red-emitting K2SiF6:Mn4+ phosphors as color converters. The luminous efficiency of the WLEDs remained at 90% after working under a relative humidity (RH) of 60% for 15 h, thereby showing promise for use as backlight devices in LCDs. {\textcopyright} 2017 The Royal Society of Chemistry.",

author = "Tongtong Xuan and Xianfeng Yang and Sunqi Lou and Junjian Huang and Yong Liu and Jinbo Yu and Huili Li and Ka-Leung Wong and Chengxin Wang and Jing Wang",

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T1 - Highly stable CsPbBr3 quantum dots coated with alkyl phosphate for white light-emitting diodes

AU - Xuan, Tongtong

AU - Yang, Xianfeng

AU - Lou, Sunqi

AU - Huang, Junjian

AU - Liu, Yong

AU - Yu, Jinbo

AU - Li, Huili

AU - Wong, Ka-Leung

AU - Wang, Chengxin

AU - Wang, Jing

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PY - 2017/10/28

Y1 - 2017/10/28

N2 - Inorganic halide perovskite quantum dots (QDs) suffer from problems related to poor water stability and poor thermal stability. Here we developed a simple strategy to synthesize alkyl phosphate (TDPA) coated CsPbBr3 QDs by using 1-tetradecylphosphonic acid both as the ligand for the CsPbBr3 QDs and as the precursor for the formation of alkyl phosphate. These QDs not only retain a high photoluminescence quantum yield (PLQY, 68%) and narrow band emission (FHWM ∼ 22 nm) but also exhibit high stability against water and heat. The relative PL intensity of the QDs was maintained at 75% or 59% after being dispersed in water for 5 h or heated to 375 K (100 °C), respectively. Finally, white light-emitting diodes (WLEDs) with a high luminous efficiency of 63 lm W-1 and a wide color gamut (122% of NTSC) were fabricated by using green-emitting CsPbBr3/TDPA QDs and red-emitting K2SiF6:Mn4+ phosphors as color converters. The luminous efficiency of the WLEDs remained at 90% after working under a relative humidity (RH) of 60% for 15 h, thereby showing promise for use as backlight devices in LCDs. © 2017 The Royal Society of Chemistry.

AB - Inorganic halide perovskite quantum dots (QDs) suffer from problems related to poor water stability and poor thermal stability. Here we developed a simple strategy to synthesize alkyl phosphate (TDPA) coated CsPbBr3 QDs by using 1-tetradecylphosphonic acid both as the ligand for the CsPbBr3 QDs and as the precursor for the formation of alkyl phosphate. These QDs not only retain a high photoluminescence quantum yield (PLQY, 68%) and narrow band emission (FHWM ∼ 22 nm) but also exhibit high stability against water and heat. The relative PL intensity of the QDs was maintained at 75% or 59% after being dispersed in water for 5 h or heated to 375 K (100 °C), respectively. Finally, white light-emitting diodes (WLEDs) with a high luminous efficiency of 63 lm W-1 and a wide color gamut (122% of NTSC) were fabricated by using green-emitting CsPbBr3/TDPA QDs and red-emitting K2SiF6:Mn4+ phosphors as color converters. The luminous efficiency of the WLEDs remained at 90% after working under a relative humidity (RH) of 60% for 15 h, thereby showing promise for use as backlight devices in LCDs. © 2017 The Royal Society of Chemistry.

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