Hexagonal β-NaYF4:Yb3+, Er3+ Nanoprism-Incorporated Upconverting Layer in Perovskite Solar Cells for Near-Infrared Sunlight Harvesting

Roh, Jaehoon; Yu, Haejun; Jang, Jyongsik

doi:10.1021/acsami.6b04760

Cited by 114 publications

(72 citation statements)

References 32 publications

(57 reference statements)

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“…Impedance spectra as a function of frequency under dark conditions with different biases (0 and 0.8 V) are exhibited in Figure 2c. [18,32] When the 0.8 V bias is applied, the fitting results in Table S1 (Supporting Information) reveal that the R s of the devices is decreased from 1.76 to 1.73 Ω cm 2 after the SAED modification. The charge transfer resistance (R s ) at a higher frequency range is the resistance at the interface of the hole transport layer/Au electrode.…”

Section: Resultsmentioning

confidence: 99%

“…[1] Benefiting from these excellent properties, the power conversion efficiency (PCE) of perovskite solar cells (PSCs) has greatly improved to converted light by photoactive materials. [18,19] Among numerous photoluminescence materials, SrAl 2 O 4 : Eu 2+ , Dy 3+ (SAED) is known as a phosphor material when a fraction of Sr sites is substituted by Eu and Dy and has been used widely as a long-lasting phosphor material without radioactive elements. [18,19] Among numerous photoluminescence materials, SrAl 2 O 4 : Eu 2+ , Dy 3+ (SAED) is known as a phosphor material when a fraction of Sr sites is substituted by Eu and Dy and has been used widely as a long-lasting phosphor material without radioactive elements.…”

Section: Introductionmentioning

confidence: 99%

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Long‐Lasting Nanophosphors Applied to UV‐Resistant and Energy Storage Perovskite Solar Cells

Chen

Jin

et al. 2017

Advanced Energy Materials

126

118

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Recently, considerable progress is achieved in lab prototype perovskite solar cells (PSCs); however, the stability of outdoor applications of PSCs remains a challenge due to the high sensitivity of perovskite material under moist and ultraviolet (UV) light conditions. In this work, the UV photostability of PSC devices is improved by incorporating a photon downshifting layer—SrAl2O4: Eu2+, Dy3+ (SAED)—prepared using the pulsed laser deposition approach. Light‐induced deep trap states in the photoactive layer are depressed, and UV light‐induced device degradation is inhibited after the SAED modification. Optimized power conversion efficiency (PCE) of 17.8% is obtained through the enhanced light harvesting and reduced carrier recombination provided by SAED. More importantly, a solar energy storage effect due to the long‐persistent luminescence of SAED is obtained after light illumination is turned off. The introduction of downconverting material with long‐persistent luminescence in PSCs not only represents a new strategy to improve PCE and light stability by photoconversion from UV to visible light but also provides a new paradigm for solar energy storage.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Long‐Lasting Nanophosphors Applied to UV‐Resistant and Energy Storage Perovskite Solar Cells

Chen

Jin

et al. 2017

Advanced Energy Materials

126

118

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“…Three emission peaks of Er 3+ at 526, 545 and 659 nm are obtained; these peaks are corresponded to 2 H 11/2 → 4 I 15/2 (526 nm), 4 S 3/2 → 4 I 15/2 (545 nm) and 4 F 9/2 → 4 I 15/2 (659 nm) transitions. Particularly, the 4 S 3/2 → 4 I 15/2 transition, a dominant peak in the emission spectrum of NaYF 4 : Yb 3+ , Er 3+ nanophosphor, which corresponds to green color under 980 nm excitation …”

Section: Resultsmentioning

confidence: 99%

Triluminescent Functional Composite Pigment for Non‐Replicable Security Codes to Combat Counterfeiting

Nagpal

2018

ChemistrySelect

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Herein, a novel strategy to design of unclonable triluminescent pigment derived security ink is formulated to protect valuable merchandise, bank notes, pharmaceuticals, confidential documents etc. against counterfeiting, by embedding luminescent security codes/images. This triluminescent security ink is designed with combinatory chemistry that involves the strategically admixing of the triluminescent functional composite pigments in commercially available polyvinyl chloride gold medium. The triluminescent functional composite pigment is composed of NaYF4: Yb3+, Er3+(Sodium Yttrium Fluoride doped with Ytterbium and Erbium ions), NaYF4: Eu3+ (Sodium Yttrium Fluoride doped with Europium ion) and ZnO (Zinc Oxide) materials which have multifunctional features as it looks white in ambient light and shows strong green (NaYF4: Yb3+, Er3+), red (NaYF4: Eu3+) and green (ZnO) colors at three different excitations of 980 nm, 254 nm and 379 nm wavelengths, respectively. The structural/microstructural and photoluminescence properties of triluminescent functional composite are confirmed by XRD (X‐ray diffraction), SEM (Scanning electron microscope), TEM (Transmission electron microscope) and photoluminescence spectroscopic techniques, respectively. The quality and spatially distributed PL intensity of printed images/code from triluminescent ink was investigated by photoluminescence confocal mapping microscopy technique. Hence, the obtained results suggest that the security code/images printed by using ink formulated from triluminescent functional composite pigment provides one step ahead novel security features which could be easy to detect but extremely difficult to replicate.

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“…Four emission peaks of Er 3+ at 413 (blue), 526 (green), 545 (green) and 659 nm (red) were observed; these peaks correspond to 2 H 9/2 → 4 I 15/2 (413 nm), 2 H 11/2 → 4 I 15/2 (526 nm), 4 S 3/2 → 4 I 15/2 (545 nm) and 4 F 9/2 → 4 I 15/2 (659 nm) transitions as shown in Supporting Information Figure S6. Particularly, this transition 4 S 3/2 → 4 I 15/2 represents a dominant peak in the emission spectrum of NaYF 4 :Yb 3+ , Er 3+ nanophosphor, which corresponds to green color under 980 nm excitation wavelength . Figure d shows the International Commission on Illumination (CIE) color coordinates corresponding to excitation at 254 nm with values of X 1 =0.63, Y 1 =0.36 and CIE color coordinates corresponding to excitation at 980 nm with values of X 2 =0.32, Y 2 =0.39.…”

Section: Figurementioning

confidence: 99%

Highly Luminescent Dual Mode Polymeric Nanofiber‐Based Flexible Mat for White Security Paper and Encrypted Nanotaggant Applications

Gupta

Kedawat

Kumar

et al. 2018

Chemistry A European J

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Increasing counterfeiting of important data, currency, stamp papers, branded products etc., has become a major security threat which could lead to serious damage to the global economy. Consequences of such damage are compelling for researchers to develop new high-end security features to address full-proof solutions. Herein, we report a dual mode flexible highly luminescent white security paper and nanotaggants composed of nanophosphors incorporated in polymer matrix to form a nanofiber-based mat for anti-counterfeiting applications. The dual mode nanofibers are fabricated by electrospinning technique by admixing the composite of NaYF :Eu @NaYF :Yb , Er nanophosphors in the polyvinyl alcohol solution. This flexible polymer mat derived from nanofibers appears white in daylight, while emitting strong red (NaYF :Eu ) and green (NaYF :Yb , Er ) colors at excitation wavelengths of 254 nm and 980 nm, respectively. These luminescent nanofibers can also be encrypted as a new class of nanotaggants to protect confidential documents. These obtained results suggest that highly luminescent dual mode polymeric nanofiber-based flexible white security paper and nanotaggants could offer next-generation high-end unique security features against counterfeiting.

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Hexagonal β-NaYF₄:Yb³⁺, Er³⁺ Nanoprism-Incorporated Upconverting Layer in Perovskite Solar Cells for Near-Infrared Sunlight Harvesting

Cited by 114 publications

References 32 publications

Long‐Lasting Nanophosphors Applied to UV‐Resistant and Energy Storage Perovskite Solar Cells

Long‐Lasting Nanophosphors Applied to UV‐Resistant and Energy Storage Perovskite Solar Cells

Triluminescent Functional Composite Pigment for Non‐Replicable Security Codes to Combat Counterfeiting

Highly Luminescent Dual Mode Polymeric Nanofiber‐Based Flexible Mat for White Security Paper and Encrypted Nanotaggant Applications

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