Journal
CHEMISTRY OF MATERIALS
Volume 31, Issue 3, Pages 1042-1047Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.chemmater.8b04596
Keywords
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Funding
- NSFCs [51702373, 51772336, 51572302]
- National Key R&D Program of China [2018YFB0406800, 2018YFB0406801]
- 973 programs [2014CB643801]
- Guangdong Provincial Science & Technology Project [2015B090926011, 2017A050501008, 2013B090800019]
- Teamwork Projects of Guangdong Natural Science Foundation [S2013030012842]
- Guangzhou Science & Technology Project [201807010104]
- Ministry of Science and Technology of Taiwan [MOST 107-2113-M-002-008-MY3]
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We present a novel composite strategy to enhance the stability of water-sensitive CsPbBr3 quantum dots (QDs) by embedding the QDs into the super-hydrophobic porous organic polymer frameworks (CPB@SHFW). The CPB@SHFW composites not only preserve a high photo-luminescence quantum yield (PLQY approximate to 60%) and narrow band emission (full width at half-maximum approximate to 16 nm) but also inherit the outstanding water-resistant property of SHFW to protect the QDs from hydrolytic degradation. The PLQY of the composites was maintained at 91% (PLQY approximate to 54.3%) of the initial one (PLQY approximate to 60%) after being immersed in water for 31 days. Even after being immersed in water for 6 months, the CPB@SHFW composites still retain a bright green emission. In addition, super-hydrophobic perovskite QD-polymer composites (IPQDs@SHFW) with tunable and bright emission were prepared by using suitable halide salts. A white light-emitting diode (WLED) device was prepared by combining green-emitting CPB@SHFW composites and red-emitting K2SiF6:Mn4+ phosphors with a blue LED chip. The device exhibits a high luminous efficiency of 50 lm/W and a wide color gamut (127% of the National Television System Committee and 95% Rec. 2020). This work provides an alternative approach to solve the challenging stability issue of perovskite QDs; therefore, it has a positive implication for their practical application in liquid crystal display backlights.
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