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The Effect of Recombination Zone Positon on the color temperature Performance in the color-Tunable White Organic Light-Emitting Diode

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Optics and Photonics Journal 2022年第4期12卷 78-87页

作者： Zhixiu Ma Ce Bian Zeyuan Gao College of Science University of Shanghai for Science and Technology Shanghai China

Using a color-tunable organic light-emitting diode (CT-OLED) can accord with the circadian cycle of humans and realize healthy lighting. The variation range of the correlated color temperature (CCT) is an important parameter to measure the performance of CT-OLEDs. In this paper, the effect of changing the utilization of phosphorescent materials and the position of the recombination zone (RZ) in the device are investigated by changing the thickness of the emissive layer (EML) and the doping ratio of the host and guest materials. The results show that reducing the red phosphorescent material and improving the blue phosphorescent material can affect the change direction of CCT, but it is not enough to expand the span of CCT (ΔCCT). It is more conducive to improving ΔCCT by more reasonable regulation of the position of the main RZ in EML and the energy transfer from the blue sub-EML to the red sub-EML. Device D obtains the best electro-optic and spectral characteristics, in which the maximum ΔCCT is 5746 K (2661 - 8407 K) as the voltage changes from 3.75 V to 9.75 V, the maximum current efficiency and luminance reach 18.34 cd·A-1 and 12,100 cd·m-2, respectively.

关键词： Optical Devices Organic Light-Emitting Diode color-Tunable Recombination Zone color temperature

Spectral optimization of color temperature unturnable and turnable white-light LEDs

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Spectral optimization of color temperature unturnable and tu...

中国光学学会2011年学术大会

作者：何国兴徐靖严华峰 Dept.of Applied Physics Dong Hua University Shanghai Yaming Lighting Co. Ltd.

Spectral optimization of multichip white-light LED are *** optimal spectra of a warm-white W/R cluster,W/R/g-B and WW/CW correlated color temperature（CCT） tunable clusters as well as a CCT tunable LED daylight simulator have been found by nonlinear program for maximizing the luminous efficacy of radiation（LER） under given requirememts of both color rendering index（CRI） and special CRI R9 for strong *** wavelength combinations are present.

关键词： LED color temperature color rendering luminous efficacy of radiation spectral optimization.

APPLICATION OF BP NEURAL NETWORK IN color temperature CALCULATION

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APPLICATION OF BP NEURAL NETWORK IN COLOR TEMPERATURE CALCUL...

2009中国宁波国际计算机科学与技术学术大会

作者： Guanyun Xiao Hongxia Zhao Zhiyang Luo Mechanical Engineering Department Jinggangshan University

One of the important indexes of light source is its color rendering property,which is directly interfered the objects’ colors reflected to our *** object with good color rendering property is less of color distortion,so we need to test the parameters of light *** popular method for getting the relative color temperature has three steps,which is to firstly obtain color tri-stimulus values X,Y and Z from PR-655 spectraScan colorimeter,and then to calculate chromaticity coordinates of light source separately,at last to solve the relative color temperature with *** method is very complicated for the calculation,therefore,we try to set up the conversion relation between color temperature of light source and chromaticity coordinates（u,v） with neural network.

关键词： color temperature Neural Network Chromaticity Coordinates

PSYCHOLOGICAL EVALUATION OF LIGHTING WITH A WIDE RANGE OF color temperatureS AND ILLUIMINANCES

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PSYCHOLOGICAL EVALUATION OF LIGHTING WITH A WIDE RANGE OF CO...

26th Session of the CIE

作者： ISHIDA,Taiichiro IKEYAMA,Kunihiko TODA,Naohiro Department of Architecture and Architectural Engineering Kyoto University Department of Architecture and Architectural Engineering Kyoto University Matsushita Electric Works Ltd

＜正＞This study examined psychological impression of lighting with a wide range of color temperatures and *** experiment was carried out using a scaled mode *** correlated color temperature（Tc）of the lighting was set to one of the following values;2000,2300,2700,5000 and 8000 *** illuminance at the center of the floor was set to one of the following values;10,30, 100,300 and 1000 *** total number of lighting conditions was 25（5 correlated color temperatures and 5 illuminance levels）.Five subjects participated in the *** observed the inside of the model box and evaluated their psychological impressions:bright-dark, active-calm,comfortable-uncomfortable,clear-vague,cheerful-quiet,soft-hard,relaxed-tense, warm-cool,sleepy-stimulative,small-large,*** was shown that the evaluation items were classified into three ***,the evaluation items such as“bright-dark”,“cheerful-quiet” were strongly affected by the illuminance *** illuminance produced bright impression. Secondly,the items such as“relaxed-tense”,“sleepy-stimulative”were influenced both by the correlated color temperature and the illuminance *** color temperature and high illuminance gave stimulative ***,the item“warm-cool”was clearly determined by the correlated color *** color temperature gave warm *** was also shown that the lighting even with very low color temperature 2000K evaluated as comfortable at higher illuminance *** results of the present study are useful for developing and considering new type light sources with very low or high correlated color temperature.

关键词： visual impression of lighting color temperature illuminance

Fabrication of High color Rendering Index White Light Emitting Diodes from Gold Nanoclusters

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Optics and Photonics Journal 2023年第11期13卷 243-250页

作者： Yeeu-Chang Lee Chieh Chen Cheng-An J. Lin Cheng-Yi Huang Chia-Hui Lin Department of Mechanical Engineering Center of Nano Technology Chung Yuan Christian University Taoyuan Department of Mechanical Engineering Chung Yuan Christian University Taoyuan Department of Biomedical Engineering Chung Yuan Christian University Taoyuan

We demonstrated gold nanoclusters as color tunable emissive light converters for the application of white light emitting diodes (WLEDs). A blue LED providing 460 nm to excite gold nanoclusters mixed with UV curable material generates broad bandwidth emission at the visible range. Increasing the amount of gold nanoclusters, the correlated color temperature of WLEDs tuned from cold white to warm white, and also results in the variation of color rendering index (CRI). The highest CRI in the experiment is 92.

关键词： Gold Nanocluster White Light Emitting Diodes color Rendering Index color temperature

Influence of Y^(3+),Bi^(3+) Content on Photoluminescence of YVO_4∶Dy^(3+) Phosphor Induced by Ultraviolet Excitation

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光谱学与光谱分析 2011年第8期31卷 2053-2057页

作者： HE Yu-yang ZHAO Mai-qun SONG Yan-yan ZHAO Gao-yang LI Feng The Faculty of Material Science and Engineering Xi＇an University of Technology Xi＇an 710048 China

YxVO4∶0.01Dy3+ and Y0.99-xVO4∶0.01Dy3+,xBi3+ phosphors were synthesized by chemical co-precipitation *** crystal structure,micromorphology and photoluminescence(PL) properties were investigated by X-ray diffraction(XRD),scan electron microscopy(SEM) and ***4∶0.01Dy3+ and Y0.99-xVO4∶0.01Dy3+,xBi3+ phosphors have a broad excitation band from about 250 to 350 nm including a strongest peak at about 310 *** its excitation,the emission spectra exhibits two sharp peaks,one of which centered at about 483 nm for 4F9/2→6H15/2 transition of Dy3+ and the other at about 574 nm due to the 4F9/2→6H13/2 transition of Dy3+.For YxVO4∶0.01Dy3+(x=0.94,0.97,0.99,1.01,1.03) phosphor,with increasing value of x,the body color of phosphor changes from yellow to white and the strongest peak in the excitation spectra shifts a little to shorter *** is detrimental to luminous intensity when Y3+ content deviates stoichiometric *** Y0.99-xVO4∶0.01Dy3+,xBi3+(x=0.01,0.05,0.1,0.15,0.2,0.25) phosphor,the samples have extraneous bismuth vanadium oxide phase except for the major tetragonal zircon structure when x≥*** increasing value of x,the band edge in the excitation spectra shifts to longer wavelength,the excitation intensity and luminous intensity increase early and decrease *** the value of x is 0.01,the intensities increase *** addition,the influence of Y3+ or Bi3+ on the color temperature of emission and micromorphology of YVO4∶Dy3+ is slight.

关键词： YVO4∶Dy3+ Phosphor Body color Photoluminescence color temperature

Calibration on the Spectral Radiance of Integral Sphere

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Calibration on the Spectral Radiance of Integral Sphere

2010亚洲光电子会议光电成像和多媒体技术分会场

作者： Fang Zhang Jiaobo Gao Jun Wang Jianjun Li (Xi’an Institute of Applied Optics Xi’an 710065 China)

We have to make the integral sphere source trace to the standard lamp,when we calibrate the imaging *** the standard lamp need to be calibrated by the blackbody *** this paper,we have the integral sphere source trace to the blackbody directly,using the exclusive spectral response of a *** the experiments,two spectral responses of the spectrometer （200nm～1100nm） within 700nm～900nm are obtained separately by measuring the spectral radiances of the blackbody at 1000℃ and the integral sphere source at some color *** get the equivalent color temperature of the integral sphere source,making use of the consistency of the two spectral responses in *** that,we can compute the spectral radiance at the exit of integral sphere by Plank *** we not only complete the calibration of the integral sphere source,but also have the integral sphere source trace to the blackbody *** the result analysis,we think this method is exact enough for the calibration about the spectral radiation of the integral sphere source.

关键词： spectrometer color temperature calibration of integral sphere

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