scholarly journals Perovskite Downconverters for Efficient, Excellent Color-Rendering, and Circadian Solid-State Lighting

Nanomaterials ◽  
2019 ◽  
Vol 9 (2) ◽  
pp. 176 ◽  
Author(s):  
Ziqian He ◽  
Caicai Zhang ◽  
Hao Chen ◽  
Yajie Dong ◽  
Shin-Tson Wu
Keyword(s):  
Solid State ◽  
Biological Effects ◽  
Low Cost ◽  
Solid State Lighting ◽  
Central Wavelength ◽  
Perovskite Nanocrystals ◽  
Color Tunable ◽  
Systematic Optimization ◽  
Color Rendering ◽  
Excellent Color

Advances in materials, color rendering metrics and studies on biological effects promote the design for novel solid-state lighting sources that are highly energy efficient, excellent at color rendering and healthy for human circadian rhythms. Recently, perovskite nanocrystals have emerged as narrow-band, low-cost, color-tunable downconverters, elevating the design and development of solid-state lighting to a new level. Here, we perform a systematic optimization of using perovskite nanocrystals as downconverters to simultaneously optimize vision energy efficiency, color rendering quality and circadian action effect of lighting sources at both fixed and tunable color temperatures. Further analysis reveals the inherent differences in central wavelength and bandwidth preferences for different cases, providing a general guideline for designing circadian lighting. Through systematic optimization, highly efficient circadian lighting sources with excellent color rendering can be achieved.

scholarly journals Photoluminescence tuning of Ca8−xSrxMgGd(PO4)7:Eu2+,yMn2+ phosphors for applications in white LEDs with excellent color rendering index

RSC Advances ◽  
2017 ◽  
Vol 7 (31) ◽  
pp. 19223-19230 ◽  
Author(s):  
Jiaqi Long ◽  
Yuzhen Wang ◽  
Chaoyang Ma ◽  
Xuanyi Yuan ◽  
Wenfeng Dong ◽  
...  
Keyword(s):  
Solid State ◽  
Solid State Reaction ◽  
White Leds ◽  
Color Rendering Index ◽  
Yellow Orange ◽  
Color Rendering ◽  
Excellent Color

Two series of novel phosphors of green-yellow emitting Ca8−xSrxMgGd(PO4)7:Eu2+ and yellow-orange emitting Sr8MgGd(PO4)7:Eu2+,yMn2+ were successfully synthesized by a solid-state reaction.

scholarly journals Emerging Perovskite Nanocrystals-Enhanced Solid-State Lighting and Liquid-Crystal Displays

Crystals ◽  
2019 ◽  
Vol 9 (2) ◽  
pp. 59 ◽  
Author(s):  
Ziqian He ◽  
Caicai Zhang ◽  
Yajie Dong ◽  
Shin-Tson Wu
Keyword(s):  
Performance Evaluation ◽  
Liquid Crystal ◽  
Solid State ◽  
Liquid Crystal Displays ◽  
Solid State Lighting ◽  
Perovskite Nanocrystals ◽  
Line Shapes ◽  
Future Challenges ◽  
Total Light ◽  
Stability Issue

Recent advances in perovskite nanocrystals-enhanced solid-state lighting (SSL) and liquid-crystal displays (LCDs) are reviewed. We first discuss the development, optical properties, and stability issue of materials, and then we evaluate the performance of SSL and LCDs with perovskite downconverters adopted. In SSL performance evaluation, we investigate the fitting-curve effect in calculations and optimizations where simple Gaussian fitting and precise fitting are compared in detail, and we further optimize for highly efficient, good color-rendering, and human-healthy SSL sources. For LCD performance evaluation, we study the intrinsic tradeoffs between total light efficiency and color gamut coverage. Through optimizations using real line shapes, Rec. 2020 standard coverage as large as 92.8% can be achieved through hybrid integration. Finally, we briefly discuss two future challenges: materials development and device integration. We believe the emerging perovskite nanocrystals are highly promising for next-generation SSL and LCDs.

Bi3+-doped Sr3Al2O6: An unusual color-tunable phosphor for solid state lighting

2013 ◽  
Vol 39 (1) ◽  
pp. 857-860 ◽  
Author(s):  
Haidong Ju ◽  
Jie Liu ◽  
Baoling Wang ◽  
Xutang Tao ◽  
Yinhai Ma ◽  
...  
Keyword(s):  
Solid State ◽  
Solid State Lighting ◽  
Color Tunable

Phosphorescent White OLEDs for Solid-state Lighting

2009 ◽  
Vol 1212 ◽  
Author(s):  
Sean Xia ◽  
Peter Levermore ◽  
Vadim Adamovich ◽  
Chun Lin ◽  
Raymond C. Kwong ◽  
...  
Keyword(s):  
Energy Transfer ◽  
Solid State ◽  
Energy Efficient ◽  
High Efficiency ◽  
Solid State Lighting ◽  
Energy Star ◽  
Lighting Industry ◽  
Partial Energy ◽  
White Oleds ◽  
Color Rendering

AbstractWhite OLEDs (WOLEDTMs) fabricated using energy efficient phosphorescent OLED (PHOLEDTM) technology open up exciting new ways to develop efficient white lighting. WOLEDs have the potential to transform the lighting industry. In this presentation, phosphorescent WOLEDs with high conductivity transport layers will be discussed. White light can be generated by partial energy transfer from blue to green and red. Single WOLED stacks are demonstrated that match the Energy Star® lighting color criteria for 2700K and 3000K with high efficiency (˜80 lm/W) and high color rendering indices (˜80). Both devices had operational lifetimes (LT70%) over 30,000 hours measured from an initial luminance of 1,000 cd/m2. Different techniques to improve optical outcoupling will also be discussed.

scholarly journals Synthesis of ZnSe Nanocrystals for Solid-state Lighting Applications

2020 ◽  
Vol 31 (1) ◽  
Author(s):  
Tran Thi Kim Chi ◽  
Bui Thi Thu Hien ◽  
Hoang Nhu Thanh ◽  
Trinh Duc Thien ◽  
Pham Nguyen Hai
Keyword(s):  
Solid State ◽  
Large Scale ◽  
Low Cost ◽  
Solid State Lighting ◽  
X Ray Diffraction ◽  
Transmission Microscopy ◽  
Current Voltage ◽  
Precursor Ratio ◽  
Microscopy Characterization ◽  
Znse Nanocrystals

We report the large-scale synthesis of highly luminescent ZnSe nanocrystals (NCs) by a simple and low-cost hydrothermal method. XRD (X-ray Diffraction) and HR-TEM (High Resolution Transmission Microscopy) characterization studies confirmed the formation of as-synthesized ZnSe NCs in cubic structure. The optical property of ZnSe NCs were tunable via controlling the Zn:Se molar precursor ratio (0.5:1–1.5:1), reaction temperature (150–200 0C), and reaction time (5–30 h). The resulting ZnSe NCs with the Zn:Se precursor ratio of 1:1, hydrothermally treated at 190 0C for 20 h exhibited the highest photoluminescence quantum yield obtained by PL spectra with the 355 nm excitation. The current–voltage (I–V) characteristics of the ZnSe NCs show its promising application in the solid-state lighting.

Bright cyan-to-green color-tunable emissions from Ce3+/Tb3+ co-activated garnet phosphors for high-color-quality solid-state lighting

2020 ◽  
Vol 17 ◽  
pp. 100487 ◽  
Author(s):  
Liangling Sun ◽  
Jia Liang ◽  
Shaoying Wang ◽  
Qi Sun ◽  
Balaji Devakumar ◽  
...  
Keyword(s):  
Solid State ◽  
Solid State Lighting ◽  
Green Color ◽  
Color Quality ◽  
Color Tunable

Promotion of solid-state lighting for ZnCdSe quantum dot modified-YAG-based white light-emitting diodes

RSC Advances ◽  
2016 ◽  
Vol 6 (57) ◽  
pp. 51989-51996 ◽  
Author(s):  
Shu-Ru Chung ◽  
Sheng-Shiun Chen ◽  
Kuan-Wen Wang ◽  
Cyuan-Bin Siao
Keyword(s):  
Solid State ◽  
Quantum Dot ◽  
White Light ◽  
Light Emitting Diodes ◽  
Solid State Lighting ◽  
Light Emitting ◽  
Photoluminescence Quantum Yield ◽  
Color Rendering Index ◽  
White Light Emitting Diodes ◽  
Color Rendering

In this study, the effect of quantum dot (QD) addition and photoluminescence quantum yield (PL QY) of QDs on the luminous efficacy and color rendering index (CRI) of white light-emitting diodes (LEDs) has been investigated.

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