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Highly efficient emission and high-CRI warm white light-emitting diodes from ligand-modified CsPbBr
3
quantum dots
Download:547次
Dongdong Yan
1†
Shuangyi Zhao
1†
Yubo Zhang
2
Huaxin Wang
1
Zhigang Zang
1,*
Author Affiliations
Abstract
1
Key Laboratory of Optoelectronic Technology & Systems (Ministry of Education), Chongqing University, Chongqing 400044, China
2
Department of Physics, Southern University of Science and Technology, Shenzhen 518055, China
All-inorganic CsPbBr
3
perovskite quantum dots (QDs) have received great attention in white light emission because of their outstanding properties. However, their practical application is hindered by poor stability. Herein, we propose a simple strategy to synthesize excellent stability and efficient emission of CsPbBr
3
QDs by using 2-hexyldecanoic acid (DA) as a ligand to replace the regular oleic acid (OA) ligand. Thanks to the strong binding energy between DA ligand and QDs, the modified QDs not only show a high photoluminescence quantum yield (PLQY) of 96% but also exhibit high stability against ethanol and water. Thereby warm white light-emitting diodes (WLEDs) are constructed by combining ligand modified CsPbBr
3
QDs with red AgInZnS QDs on blue emitting InGaN chips, exhibiting a color rendering index of 93, a power efficiency of 64.8 lm/W, a CIE coordinate of (0.44, 0.42) and correlated color temperature value of 3018 K. In addition, WLEDs based on ligand modified CsPbBr
3
QDs also exhibit better thermal performance than that of WLEDs based on the regular CsPbBr
3
QDs. The combination of improved efficiency and better thermal stability with high color quality indicates that the modified CsPbBr
3
QDs are ideal for WLEDs application.
CsPbBr3 quantum dots
ligand modification
stability
efficiency
white light-emitting diodes
PDF全文
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Opto-Electronic Advances
2022, 5(1): 200075
Optical and Photonic Materials
Inorganic halide perovskites for lighting and visible light communication
Shuangyi Zhao
1†
Qionghua Mo
1†
Baiqian Wang
Wensi Cai
[ ... ]
Zhigang Zang
*
Author Affiliations
Abstract
Key Laboratory of Optoelectronic Technology & Systems (Ministry of Education), Chongqing University, Chongqing 400044, China
Inorganic halide perovskites (IHPs) have received substantial attention due to their unique optoelectronic properties. Among all the intriguing performance, the efficient luminescence of IHPs enables the practical application of white light-emitting diodes (WLEDs) for lighting. During the last decade, IHP-based white lighting sources with a high luminesce and a broad color gamut have been developed as strong competitors to conventional and classic WLEDs based on rare-earth phosphors and blue LED chips. Thus, it inspires us to give an overview of the emerging progress of IHP WLEDs that can function as lighting sources. Here, in this review, the generation of luminescent properties and white light in IHPs are first presented. Then, both photoluminescence and electroluminescence WLEDs with IHPs emitters, including both lead-based and lead-free IHPs, are synthetically discussed to exhibit their advantages. Furthermore, the efforts on the optical performance enhancement of IHPs in WLEDs are demonstrated and summarized. Apart from WLEDs, visible light communication based on IHPs featuring efficient luminescence is proposed to highlight their promising potential in lighting communication. Finally, some perspectives on the evolution and challenges are described, followed by an inspirational outlook on their future development.
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Photonics Research
2022, 10(4): 04001039
光通信与光传感
无机钙钛矿白光LED及可见光通信研究进展(特邀)
下载:1027次
赵双易
莫琼花
汪百前
臧志刚
*
作者单位
摘要
重庆大学 光电工程学院,重庆 400044
在现代社会中,白光发光二极管(LED)在照明和显示背板等诸多领域都有着重要的基础性作用。为了获得具有优异性能的白光LED,首先需要获得满足白光LED发光需要的高性能的发光材料。而作为一类新兴的半导体材料,无机钙钛矿(CsPbX
3
, X = Cl, Br, I)由于其具有的高发光量子产率、发光波长可调、色纯度高和稳定性好等优点,在发光应用特别是白光LED领域展现出了巨大的潜力。文中将首先分别从光致白光LED和电致白光LED两个方面出发,综述近期在基于无机钙钛矿的白光LED方面所取得的研究进展,随后分别介绍以上两个体系中改性后的无机钙钛矿发光材料与其他发光材料复合形成白光以及无机钙钛矿单组分白光的代表性成果。最后,对钙钛矿白光LED在可见光通信方面所取得的最新进展进行介绍,并且对白光LED以及可见光通信的研究发展趋势与挑战进行了总结和展望。
白光LED
钙钛矿发光材料
可见光通信
white LEDs
perovskites luminescent material
visible light communication
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红外与激光工程
2022, 51(1): 20210772
Optical and Photonic Materials
Inorganic lead-free cesium copper chlorine nanocrystal for highly efficient and stable warm white light-emitting diodes
Download:657次
Shuangyi Zhao
1†
Qionghua Mo
1†
Wensi Cai
Huaxin Wang
Zhigang Zang
*
Author Affiliations
Abstract
Key Laboratory of Optoelectronic Technology & Systems (Ministry of Education), Chongqing University, Chongqing 400044, China
Inorganic cesium lead halide (
CsPbX
3
,
X
=
Cl
, Br, I) nanocrystals (NCs) attract extensive attention because of their excellent optoelectronic performance. However, the classic
CsPbX
3
NCs suffer from toxicity and instability, which impede their further applications in commercial fields. Here the inorganic lead-free cesium copper chlorine NCs are synthesized by a facile hot-injection method. The blue-emission 3D
CsCu
2
Cl
3
and green-emission 0D
Cs
3
Cu
2
Cl
5
NCs are prepared at 70°C and 120°C, respectively, suggesting that the reaction temperature may account for the final components. Owing to the self-trapped exciton effect, the unique optical properties, such as high photoluminescence (PL) quantum yield, broadband emission, large Stokes shift, and long PL decay time, are demonstrated for both cesium copper chlorine NCs. Moreover, highly efficient and stable warm white light-emitting diodes are fabricated with
CsCu
2
Cl
3
and
Cs
3
Cu
2
Cl
5
NCs. The study highlights the promising potential for lead-free cesium copper chlorine nanocrystals in nontoxic solid-state lighting applications.
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Photonics Research
2021, 9(2): 02000187
Optical and Photonic Materials
Room temperature synthesis of stable silica-coated CsPbBr
3
quantum dots for amplified spontaneous emission
Download:782次
Qionghua Mo
1†
Tongchao Shi
2†
Wensi Cai
1
Shuangyi Zhao
1,*
[ ... ]
Zhigang Zang
1,5
Author Affiliations
Abstract
1
Key Laboratory of Optoelectronic Technology & Systems (Ministry of Education), Chongqing University, Chongqing 400044, China
2
State Key Laboratory of High Field Laser Physics, Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai 201800, China
3
Hangzhou Institute for Advanced Study, University of Chinese Academy of Sciences, Hangzhou 310024, China
4
e-mail: dujuan@mail.siom.ac.cn
5
e-mail: zangzg@cqu.edu.cn
All-inorganic cesium lead bromide (
CsPbBr
3
) perovskite quantum dots (QDs) with excellent optical properties have been regarded as good gain materials for amplified spontaneous emission (ASE). However, the poor stability as the results of the high sensitivity to heat and moisture limits their further applications. Here, we report a facile one-pot approach to synthesize
CsPbBr
3
@
SiO
2
QDs at room temperature. Due to the effective defects passivation using
SiO
2
, as-prepared
CsPbBr
3
@
SiO
2
QDs present an enhanced photoluminescence quantum yield (PLQY) and chemical stability. The PLQY of
CsPbBr
3
@
SiO
2
QDs reaches 71.6% which is higher than 46% in pure
CsPbBr
3
QDs. The PL intensity of
CsPbBr
3
@
SiO
2
QDs maintains 84% while remaining 24% in pure
CsPbBr
3
after 80 min heating at 60°C. The ASE performance of the films is also studied under a two-photon-pumped laser. Compared with the films using pure
CsPbBr
3
QDs, those with as-prepared
CsPbBr
3
@
SiO
2
QDs exhibit a reduced threshold of ASE. The work suggests that room-temperature-synthesized
SiO
2
-coated perovskites QDs are promising candidates for laser devices.
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Photonics Research
2020, 8(10): 10001605
Optical and Photonic Materials
Ultrapure and highly efficient green light emitting devices based on ligand-modified CsPbBr
3
quantum dots
Download:782次
Dongdong Yan
Shuangyi Zhao
Huaxin Wang
Zhigang Zang
*
Author Affiliations
Abstract
Key Laboratory of Optoelectronic Technology & Systems (Ministry of Education), Chongqing University, Chongqing 400044, China
All inorganic
CsPbBr
3
perovskite quantum dots (QDs) have been recognized as promising optical materials to fabricate green light emission devices because of their excellent optical performance. However, regular
CsPbBr
3
QDs with an oleic acid (OA) ligand show poor stability, which limits their practical application. We replaced the OA ligand in
CsPbBr
3
QDs with a 2-hexyldecanoic acid (DA) ligand and, in the synthesis, found that the new material has better optical properties than regular
CsPbBr
3
QDs (
CsPbBr
3
-
OA
QDs). Due to the strong binding energy between the DA ligand and QDs, the ligand-modified
CsPbBr
3
QDs (
CsPbBr
3
-
DA
QDs) show a high photoluminescence quantum yield (PLQY) of 96%, while the PLQY of
CsPbBr
3
-
OA
QDs is 84%. Subsequently, the
CsPbBr
3
QDs coated on the blue light-emitting diode (LED) chips as green phosphors are demonstrated. The color conversion from blue to pure green is achieved by adding the
CsPbBr
3
-
OA
QDs solution up to 60 μL, while the pure green emission devices only need 18 μL
CsPbBr
3
-
DA
QDs solution under the same concentration. The ultrapure, highly efficient green light-emitting devices based on
CsPbBr
3
-
DA
QDs exhibit a luminous efficiency of 43.6 lm/W with a CIE (0.2086, 0.7635) under a 15.3 mA driving current. In addition, the green emission wavelength of the devices based on
CsPbBr
3
-
DA
QDs almost has no shift, even under a high injection current. These results highlight the promise of DA ligand-modified
CsPbBr
3
QDs for light-emitting devices and enrich the application field of ligand-modified
CsPbBr
3
QDs.
PDF全文
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Photonics Research
2020, 8(7): 07001086
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