light emitting diodes
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2022 ◽  
Vol 149 ◽  
pp. 107864
Suk-Ho Song ◽  
Jae-In Yoo ◽  
Hyo-Bin Kim ◽  
Yong-Sang Kim ◽  
Sang Soo Kim ◽  

Daniel Patricko Hutabarat ◽  
Rudy Susanto ◽  
Bryan Prasetya ◽  
Barry Linando ◽  
Senanayake Mudiyanselage Namal Senanayake

<span>The purpose of this research is to create a smart system based on internet of things (IoT) application for a plant aquarium. This smart system helps users to maintain the environment's parameters of the plant aquarium. In this study, the parameters to be controlled by the system are light intensity and temperature. The hardware used to develop this system is the ESP32 as the microcontroller, BH1750FVI as the light sensor, high power led (HPL) light-emitting diodes (LED) lamp as the light source, DS18B20 as temperature sensor, the heater, and the 220 VAC fan that is used to raise and lower the temperature. In this study also developed an application that is used by the user to provide input to the system. The developed application is then installed on the user's smartphone and used to connect the user to the system via the internet. The ease of adding and removing devices used on the system is a capability that is also being developed in this smart system. The developed system can produce light intensity with accuracy rate of 96% and always manage to keep the temperature within the predetermined range.</span>

2022 ◽  
Vol 124 ◽  
pp. 111975
Zehao Hu ◽  
Ting Chen ◽  
Zhixiang Xie ◽  
Chunxian Guo ◽  
Weihui Jiang ◽  

2022 ◽  
Vol 429 ◽  
pp. 132347
Jianchao Dong ◽  
Feifei Lu ◽  
Jie Wang ◽  
Yu Zhang ◽  
Xue Ma ◽  

2022 ◽  
Vol 9 ◽  
Zirong Wang ◽  
Fanyuan Meng ◽  
Qi Feng ◽  
Shengxuan Shi ◽  
Langwen Qiu ◽  

Recently, quasi-two-dimensional (Q-2D) perovskites have received much attention due to their excellent photophysical properties. Phase compositions in Q-2D perovskites have obvious effect on the device performance. Here, efficient green perovskite light-emitting diodes (PeLEDs) were fabricated by employing o-fluorophenylethylammonium bromide (o-F-PEABr) and 2-aminoethanol hydrobromide (EOABr) as the mix-interlayer ligands. Phase compositions are rationally optimized through composition and interlayer engineering. Meanwhile, non-radiative recombination is greatly suppressed by the introduction of mix-interlayer ligands. Thus, green PeLEDs with a peak photoluminescence quantum yield (PLQY) of 81.4%, a narrow full width at half maximum (FWHM) of 19 nm, a maximum current efficiency (CE) of 27.7 cd/A, and a maximum external quantum efficiency (EQE) of 10.4% were realized. The results are expected to offer a feasible method to realize high-efficiency PeLEDs.

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