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On the accurate characterization of quantum-dot light-emitting diodes for display applications

npj Flexible Electronics 2022年第1期6卷 351-362页

作者： Wangxiao Jin Yunzhou Deng Bingbing Guo Yaxiao Lian Baodan Zhao Dawei Di Xiaowei Sun Kai Wang Shuming Chen Yixing Yang Weiran Cao Song Chen Wenyu Ji Xuyong Yang Yuan Gao Shuangpeng Wang Huaibin Shen Jialong Zhao Lei Qian Fushan Li Yizheng Jin Key Laboratory of Excited-State Materials of Zhejiang Province State Key Laboratory of Silicon MaterialsDepartment of ChemistryZhejiang University310027 HangzhouChina State Key Laboratory of Modern Optical Instrumentation College of Optical Science and EngineeringInternational Research Center for Advanced PhotonicsZhejiang University310027 HangzhouChina Department of Electronic and Electrical Engineering Southern University of Science and Technology518055 ShenzhenChina TCL Research ShenzhenGuangdongChina Shenzhen China Star Optoelectronics Semiconductor Display Technology Co. LtdShenzhenGuangdongChina College of Chemistry Chemical Engineering and Materials ScienceSoochow University199 Ren’ai Rd215123 SuzhouJiangsuChina Key Lab of Physics and Technology for Advanced Batteries(Ministry of Education) College of PhysicsJilin University130023 ChangchunChina Key Laboratory of Advanced Display and System Applications of Ministry of Education Shanghai University149 Yanchang RoadShanghai 200072China Najing Technology Corporation Ltd Hangzhou 310052China Institute of Applied Physics and Materials Engineering University of MacaoTaipaMacaoSAR 999078China Key Laboratory for Special Functional Materials of Ministry of Education National&Local Joint Engineering Research Center for High-Efficiency Display and Lighting Technologyand Collaborative Innovation Center of Nano Functional Materials and ApplicationsHenan UniversityKaifeng 475004China School of Physical Science and Technology MOE Key Laboratory of New Processing Technology for Non-ferrous Metals and MaterialsGuangxi Key Laboratory of Processing for Non-ferrous Metals and Featured MaterialsGuangxi UniversityNanning 530004China Division of Functional Materials and Nanodevices Ningbo Institute of Materials Technology and EngineeringChinese Academy of SciencesNingbo 315201China College of Physics and Information Engineering Fuzhou UniversityFuzhou 350108China

Quantum dot light-emitting diodes(QLEDs)are a class of high-performance solution-processed electroluminescent(EL)devices highly attractive for next-generation display *** the encouraging advances in the mechanism investigation,material chemistry,and device engineering of QLEDs,the lack of standard protocols for the characterization of QLEDs may cause inaccurate measurements of device parameters and invalid comparison of different ***,we report a comprehensive study on the characterizations of QLEDs using various *** show that the emission non-uniformity across the active area,nonLambertian angular distributions of EL intensity,and discrepancies in the adopted spectral luminous efficiency functions could introduce significant errors in the device *** errors in the operational-lifetime measurements may arise from the inaccurate determination of the initial luminance and inconsistent methods for analyzing the luminance-decay ***,we suggest a set of recommended practices and a checklist for device characterizations,aiming to help the researchers in the QLED field to achieve accurate and reliable measurements.

关键词： diodes characterization luminous

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Development of microheaters for gas sensor with an AT-Mega 8535 temperature controller using a PWM (pulse width modulation) method

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AIP Conference Proceedings 2016年第1期1719卷

作者： Meti Megayanti Camellia Panatarani I. Made Joni 1Instrumentation System and Functional Material Processing Laboratory Department of Physics Faculty of Mathematics and Natural Sciences Universitas Padjadjaran Jalan Raya Bandung-Sumedang KM 21 Jatinangor 45363 West Java Indonesia

Microheater is the main component in gas sensor characterized by their sensitivity, selectivity, and time response of gas sensor which is depend on the microheater temperature stability. A Cu microheater was developed and utilized AT-Mega 8535 controller using a PWM (pulse width modulation) method. This control system is interfaced to the PC to observe the real time temperature response of the microheater. Three initial resistance (R0) variations of microheater were developed in an open loop control system. The power characteristic of designed microheater depends on the specified microheater initial resistance. The smaller R0, the less power required to reach a temperature setting value. The developed microheater was designed to reach a temperature setting value of 250°C having resistance 0.531 Ω for 1.979 Watt and 0.265 Ω for 1.072 Watt respectively. The results of the investigation on the control performances shows microheater-control system achieved operating temperature up to 250°C. The response of the temperature control shows smallest R0 resulted in a high stability with short settling time, short delay time and small ripple for temperature setting values higher than 150°C. The obtained error of microheater temperature with R0 = 0.265 is 8.596 %. It is concluded that the developed microheater can be utilized as a component of a gas sensor.

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Challenging and development of phosphors for lighting applications

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AIP Conference Proceedings 2016年第1期1712卷

作者： Camellia Panatarani I. Made Joni Instrumentation System and Functional Material Processing Lab. Department of Physics Faculty of Mathematics and Natural Sciences Universitas Padjadjaran Jalan Raya Bandung-Sumedang KM 21 Jatinangor 45363 West Java Indonesia

Phosphors (inorganics luminescent material) have been extensively investigated due to their potential application especially for lighting. This article briefly reviews the developments of the phosphors for lighting application. Research and development of phosphors for the application of energy-saving lamps have been developed in the laboratory of instrumentation system and functional materials processing, department of physics, Universitas Padjadjaran. To fulfill the desired feature for lighting application, we developed host-center type phosphor with compositional modifications prepared by spray pyrolysis and simple solution routes. In order to meet the industry requirement with high production rate, currently we scaled up the spray pyrolysis utilized with a pulse combustion reactor.

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Development of a smart DC grid model

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AIP Conference Proceedings 2016年第1期1719卷

作者： Amty Ma’rufah Ardhiyah Dalimunthe Jajat Yuda Mindara Camellia Panatarani I. Made Joni Lab. of Instrumentation System and Functional Material Processing Physics Department Faculty of Mathematics and Natural Sciences Padjadjaran University Jl. Raya Bandung-Sumedang KM21 Jatinangor 45363 Jawa Barat Indonesia

Smart grid and distributed generation should be the solution of the global climate change and the crisis energy of the main source of electrical power generation which is fossil fuel. In order to meet the rising electrical power demand and increasing service quality demands, as well as reduce pollution, the existing power grid infrastructure should be developed into a smart grid and distributed power generation which provide a great opportunity to address issues related to energy efficiency, energy security, power quality and aging infrastructure systems. The conventional of the existing distributed generation system is an AC grid while for a renewable resources requires a DC grid system. This paper explores the model of smart DC grid by introducing a model of smart DC grid with the stable power generation give a minimal and compressed circuitry that can be implemented very cost-effectively with simple components. The PC based application software for controlling was developed to show the condition of the grid and to control the grid become ‘smart’. The model is then subjected to a severe system perturbation, such as incremental change in loads to test the performance of the system again stability. It is concluded that the system able to detect and controlled the voltage stability which indicating the ability of power system to maintain steady voltage within permissible rangers in normal condition.

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Effect of binders on natural graphite powder-based gas diffusion electrode for Mg-air cell

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AIP Conference Proceedings 2016年第1期1719卷

作者： Ghenadi Arinton Anton Rianto Ferry Faizal Darmawan Hidayat Sahrul Hidayat Camellia Panatarani I. Made Joni 1Grafindo Nusantara Ltd. Bellagio Mall Lantai 2 Unit 0 L3-19 Kawasan Mega Kuningan Kav. B4 No. 3 Jakarta Selatan Indonesia 2Instrumentation System and Functional Material Processing Laboratory Department of Physic Universitas Padjadjaran Jl. Raya Bandung-Sumedang Km 21 Jatinangor West Java 45363 Indonesia 3Energy and System Laboratory Department of Physic Universitas Padjadjaran Jl. Raya Bandung-Sumedang Km 21 Jatinangor West Java 45363 Indonesia

This paper mainly discussed the electrical performance of gas diffusion electrode of Mg-Air Cell. The gas diffusion electrodes (GDE) use a natural graphite powder as catalyst material. The effect of additional binders to the GDE have been investigated to improve electrode performances. Several types of GDE have been developed using binder materials such as epoxy resin, natural clay, carboxymethyl cellulose (CMC) and urea-formaldehyde (UF). By using discharge performance measurement, the characteristics of the as-prepared GDEs are reported.

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Purification and preparation of graphite oxide from natural graphite

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AIP Conference Proceedings 2016年第1期1719卷

作者： C. Panatarani N. Muthahhari Anton Rianto I. Made Joni 1Instrumentation Systems and Functional Material Processing Laboratory Department of Physics Faculty of Mathematics and Natural Sciences Universitas Padjadjaran Padjadjaran University Jl. Raya Bandung-Sumedang KM 21 Jatinangor 45363 Jawa Barat Indonesia 2Grafindo Nusantara Ltd. Belagio Mall Lantai 2 Unit 0 L3-19 Kawasan Mega Kuningan Kav. B4 No.3 Jakarta Selatan Indonesia

Graphite oxide has attracted much interest as a possible route for preparation of natural graphite in the large-scale production and manipulation of graphene as a material with extraordinary electronic properties. Graphite oxide was prepared by modified Hummers method from purified natural graphite sample from West Kalimantan. We demonstrated that natural graphite is well-purified by acid leaching method. The purified graphite was proceed for intercalating process by modifying Hummers method. The modification is on the reaction time and temperature of the intercalation process. The materials used in the intercalating process are H2SO4 and KMNO4. The purified natural graphite is analyzed by carbon content based on Loss on Ignition test. The thermo gravimetricanalysis and the Fouriertransform infrared spectroscopy are performed to investigate the oxidation results of the obtained GO which is indicated by the existence of functional groups. In addition, the X-ray diffraction and energy dispersive X-ray spectroscopy are also applied to characterize respectively for the crystal structure and elemental analysis. The results confirmed that natural graphite samples with 68% carbon content was purified into 97.68 % carbon content. While the intercalation process formed a formation of functional groups in the obtained GO. The results show that the temperature and reaction times have improved the efficiency of the oxidation process. It is concluded that these method could be considered as an important route for large-scale production of graphene.

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Improvement on droplet production rate of ultrasonic - nebulizer in spray pyrolysis process

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AIP Conference Proceedings 2013年第1期1554卷 201-204页

作者： Camellia Panatarani Tuti Aryati Demen Liu Kin Men Dwindra Wilham Maulana Darmawan Hidayat I Made Joni Laboratory of Instrumentation System and Functional Material Processing Department of Physics Faculty of Mathematics and Natural Sciences Universitas Padjadjaran Jalan Raya Bandung-Sumedang KM 21 Jatinangor 45363 West Java Indonesia Laboratory of Instrumentation System and Functional Material Processing Department of Physics Faculty of Mathematics and Natural Sciences Universitas Padjadjaran Jalan Raya Bandung-Sumedang KM 21 Jatinangor 45363 West Java Indonesia

Atomization is an important part in Spray Pyrolysis (SP) process which is applied to synthesize submicron or nano sized particles or to deposit thin film. Ultrasonic Nebulizer (UN) is usually use in SP due to its homogeneous droplets production with size between 1-5 μm. The drawback of the UN is low droplets production rate. In this research, we successfully developed a Digital Ultrasonic Nebulizer (DUN) with high droplets production rate using two ultrasonic traducers with applied frequency of 2.4 MHz. The result of DUN atomization was improved 4-6 fold compare to the conventional UN. The DUN also has an additional digital features such as pushbutton, LCD and microcontroller which is allow to set duration and applied voltage.

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Additional of polyethylene glycol on the preparation of LaPO4:Eu3+ phosphor

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AIP Conference Proceedings 2013年第1期1554卷 109-111页

作者： Camellia Panatarani I Made Joni Laboratory of Instrumentation System and Functional Material Processing Department of Physics Faculty of Mathematics and Natural Sciences Universitas Padjadjaran Jalan Raya Bandung-Sumedang KM 21 Jatinangor 45363 West Java Indonesia Laboratory of Instrumentation System and Functional Material Processing Department of Physics Faculty of Mathematics and Natural Sciences Universitas Padjadjaran Jalan Raya Bandung-Sumedang KM 21 Jatinangor 45363 West Java Indonesia

Solution phase method was used to synthesis nanocrystal LaPO4:Eu3+ . Polyethylene glycol with vary molecular weight (MW) was added to allow an exothermic reaction to get a high crystalinity of LaPO4:Eu3+ . The x-ray pattern of as prepared LaPO4 was obtained by using an X'pert PANalytical diffractometer with CuKα radiation (λ = 1.5406 Å) and the photoluminescent measurement spectra is obtained by using Fluorescence Spectrometer LS55, Perkin Elmer. The additional of various MW of polyethylene glycol into the precursor solution of LaPO4:Eu3+ affected the crystal structure and luminescent properties. Higher MW of PEG depressing the luminescent spectra. The emission origin from 5D0-7F4 transition vanished by additional 500,000 and 2,000,000 MW of PEG.

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Optical properties of amorphous silicon quantum dots (a-Si QDs) with various dot size using extended Hückel theory

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AIP Conference Proceedings 2013年第1期1554卷 198-200页

作者： Setianto Liu Kin Men Ferry Faizal Bambang Mukti Wibawa Doy Hardoyo Hardjo Camellia Panatarani I Made Joni Laboratory of Instrumentation System and Functional Material Processing Department of Physics Faculty of Mathematics and Natural Sciences Universitas Padjadjaran Jalan Raya Bandung-Sumedang km 21 Jatinangor 45363 West Java Indonesia

A high quality amorphous silicon (a-Si) nanostructures has grown experimentally to study the origin of light emission and the quantum confinement effect in a-Si. The quantum confinement effect increases the band gap of material as the size of quantum structure decreases, which results in a blue shift in optical luminescence and energy absorption. Here we demonstrate this effect using extended Hückel method to calculate fundamental band gap and optical absorption energy of a-Si samples with various dot sizes. As result, when the dot size was decreased from 2.2 to 1.0 nm, the absorption spectra peak shifted toward higher energy from 2.278 eV to 3.856 eV.

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Development and characterization of integrating sphere for photometry and radiometry measurement

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AIP Conference Proceedings 2013年第1期1554卷 170-173页

作者： Bambang Mukti Wibawa Abdul Al Mujahid Jajat Yuda Mindara Camellia Panatarani I Made Joni Rustam Efendi Siregar Laboratory of Instrumentation System and Functional Material Processing Department of Physics Faculty of Mathematics and Natural Sciences Universitas Padjadjaran Jalan Raya Bandung-Sumedang km 21 Jatinangor 45363 West Java Indonesia

Integrating Sphere (IS) is an instrument formed a cavity sphere with its inner surface act as a Lambertian reflector. IS is needed in many optical measurements which involves a high diffused reflection. In addition, IS very essential in photometry and radiometry measurement system. However, currently, IS is still an imported product which considered very expensive. The material for the sphere and inner surface coating affect the performance of the IS systems. Therefore, the main challenges in designing IS are the material engineering for the sphere and the procedure for the inner surface coating. The inner surface was coated using BaSO4 which has a low absorption and high diffuse reflection. Spectral responses of the IS system was characterized using USB2000+ and calibrated using a standard Spectralon from ocean optic. The obtained IS system used an inner surface coating from a mixed 80% Barium Sulfate ( BaSO4 ) and 20% Nippon Elastex paint which yield a reflection factor ρ = 0.955 and amplification factor M=10.69. The validation was conducted using an emitter with known specification from Luxeon of LXHL-DW01 which produced light flux 40.5 lumen with injection current 350 mA and junction temperature Tj 25°C.

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