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Benzyl Alcohol-Treated CH3NH3PbBr3 Nanocrystals Exhibiting High Luminescence, Stability, and Ultralow Amplified Spontaneous Emission Thresholds
Nano Letters ( IF 9.6 ) Pub Date : 2017-11-14 00:00:00 , DOI: 10.1021/acs.nanolett.7b03272 Sjoerd A. Veldhuis 1 , Yong Kang Eugene Tay 2 , Annalisa Bruno 1, 2 , Sai S. H. Dintakurti 1 , Saikat Bhaumik 1 , Subas Kumar Muduli 1 , Mingjie Li 2 , Nripan Mathews 1, 3 , Tze Chien Sum 2 , Subodh G. Mhaisalkar 1, 3
Nano Letters ( IF 9.6 ) Pub Date : 2017-11-14 00:00:00 , DOI: 10.1021/acs.nanolett.7b03272 Sjoerd A. Veldhuis 1 , Yong Kang Eugene Tay 2 , Annalisa Bruno 1, 2 , Sai S. H. Dintakurti 1 , Saikat Bhaumik 1 , Subas Kumar Muduli 1 , Mingjie Li 2 , Nripan Mathews 1, 3 , Tze Chien Sum 2 , Subodh G. Mhaisalkar 1, 3
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We report the high yield synthesis of about 11 nm sized CH3NH3PbBr3 nanocrystals with near-unity photoluminescence quantum yield. The nanocrystals are formed in the presence of surface-binding ligands through their direct precipitation in a benzyl alcohol/toluene phase. The benzyl alcohol plays a pivotal role in steering the surface ligands binding motifs on the NC surface, resulting in enhanced surface-trap passivation and near-unity PLQY values. We further demonstrate that thin films from purified CH3NH3PbBr3 nanocrystals are stable >4 months in air, exhibit high optical gain (about 520 cm–1), and display stable, ultralow amplified spontaneous emission thresholds of 13.9 ± 1.3 and 569.7 ± 6 μJ cm–2 at one-photon (400 nm) and two-photon (800 nm) absorption, respectively. To the best of our knowledge, the latter signifies a 5-fold reduction of the lowest reported threshold value for halide perovskite nanocrystals to date, which makes them ideal candidates for light-emitting and low-threshold lasing applications.
中文翻译：
经苄醇处理的CH 3 NH 3 PbBr 3纳米晶体具有高发光性，稳定性和超低放大的自发发射阈值
我们报告高产率合成的约11纳米大小的CH 3 NH 3 PbBr 3纳米晶体具有近统一的光致发光量子产率。通过在苄醇/甲苯相中直接沉淀，在表面结合配体存在下形成纳米晶体。苯甲醇在控制NC表面上的表面配体结合基序中起着关键作用，从而导致增强的表面陷阱钝化和接近统一的PLQY值。我们进一步证明，纯化的CH 3 NH 3 PbBr 3纳米晶体的薄膜在空气中稳定> 4个月，显示出高光学增益（约520 cm –1）。），并在一个光子（400 nm）和两个光子（800 nm）的吸收下显示稳定的超低放大自发发射阈值，分别为13.9±1.3和569.7±6μJcm -2。据我们所知，后者表示迄今为止，卤化物钙钛矿纳米晶体的最低报告阈值降低了5倍，这使其成为发光和低阈值激光应用的理想候选者。
更新日期：2017-11-15
中文翻译：
经苄醇处理的CH 3 NH 3 PbBr 3纳米晶体具有高发光性，稳定性和超低放大的自发发射阈值
我们报告高产率合成的约11纳米大小的CH 3 NH 3 PbBr 3纳米晶体具有近统一的光致发光量子产率。通过在苄醇/甲苯相中直接沉淀，在表面结合配体存在下形成纳米晶体。苯甲醇在控制NC表面上的表面配体结合基序中起着关键作用，从而导致增强的表面陷阱钝化和接近统一的PLQY值。我们进一步证明，纯化的CH 3 NH 3 PbBr 3纳米晶体的薄膜在空气中稳定> 4个月，显示出高光学增益（约520 cm –1）。），并在一个光子（400 nm）和两个光子（800 nm）的吸收下显示稳定的超低放大自发发射阈值，分别为13.9±1.3和569.7±6μJcm -2。据我们所知，后者表示迄今为止，卤化物钙钛矿纳米晶体的最低报告阈值降低了5倍，这使其成为发光和低阈值激光应用的理想候选者。
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