In this paper, we report on the first observation of blue-light emission bands from europium-doped tantalum pentoxide (Ta2O5:Eu) thin films prepared using a simple co-sputtering method. We prepared four specimens from...In this paper, we report on the first observation of blue-light emission bands from europium-doped tantalum pentoxide (Ta2O5:Eu) thin films prepared using a simple co-sputtering method. We prepared four specimens from one as-deposited sample, and we subsequently annealed them at 700°C, 800°C, 900°C, or 1000°C for 20 min. Four remarkable photoluminescence (PL) peaks at wavelengths of 600, 620, 650, and 700 nm due to the 5D0→7F1, 5D0→7F2, 5D0→7F3, and 5D0→7F4 transitions of Eu3+ were observed from all the specimens, and blue PL peaks around a wavelength of 450 nm were also observed from the specimens annealed at 800°C, 900°C, and 1000°C. The blue PL peaks seem to be originated from the 4f65d1→4f7 transition of Eu2+. Both Eu3+ and Eu2+ ions seem to exist in our Ta2O5:Eu co-sputtered thin films annealed at temperatures from 800°C to 1000°C. Such Ta2O5:Eu co-sputtered thin films seem to be used as multi-functional coating films having both anti-reflection and down-conversion effects for realizing high-efficiency silicon solar cells.展开更多
We prepared thulium-doped tantalum (V) oxide (Ta2O5:Tm) thin films using co-sputtering of two Tm2O3 pellets and a Ta2O5 disc, and we observed photoluminescence (PL) peaks not only around a wavelength of 800 nm due to ...We prepared thulium-doped tantalum (V) oxide (Ta2O5:Tm) thin films using co-sputtering of two Tm2O3 pellets and a Ta2O5 disc, and we observed photoluminescence (PL) peaks not only around a wavelength of 800 nm due to the 3H4→3H6 transition of Tm3+ but also around a wavelength of 400 nm (violet) from the films after annealing for the first time. Comparatively narrow PL peaks around the wavelength of 400 nm were observed from the films annealed at 800°C and 900°C for 20 min. The peak intensity from the film annealed at 900°C was approximately four-times stronger than that from the film annealed at 800°C. The origin of the 400-nm peaks seems to be the same as our non-doped Ta2O5 thin films deposited using radio-frequency sputtering because we observe PL peaks around 400 - 430 nm from the Ta2O5 films. Such a Ta2O5:Tm co-sputtered thin film seems to be used as a multi-functional coating film having both anti-reflection and down-conversion effects for realizing a high-efficiency silicon solar cell.展开更多
Background: Narrow band imaging (NBI) is reported to improve the diagnostic importance of nasopharyngeal cancer. The purpose of this review was to evaluate the diagnostic significance of NBI in the literature and comp...Background: Narrow band imaging (NBI) is reported to improve the diagnostic importance of nasopharyngeal cancer. The purpose of this review was to evaluate the diagnostic significance of NBI in the literature and compare it to the conventional white light endoscopy. The use of narrow band imaging (NBI) and further technological achievements concerning the resolution and magnification of endoscopic images have in the past 15 years. With the use of NBI, superficial mucosal lesions, which may be missed by standard WLI endoscopy, can be identified easily by their neoangiogenic pattern. Objective:?To assess diagnostic value of the narrow band imaging and white light endoscopy in nasopharyngeal carcinoma and compare diagnostic values (sensitivity, specificity, positive predictive value and negative predictive value) with white light endoscopy. Search Methods: From 2010 to 2020, data was searched from electronic databases such as PubMed, web of science. We used narrow band imaging as a key word accordance with diagnostic modalities such as sensitivity, specificity, PPV and NPV and data were collected. Results: We have found mainly 6 studies have discussed about diagnostic value of endoscopy in nasopharyngeal carcinoma in the total of 2746 suspected patients. Among them, 5 studies have compared diagnostic values such as sensitivity, specificity, positive predictive value and negative predictive value between NBI and WLE. Among 5 studies, 4 studies have found higher sensitivity in NBI, 2 studies found higher 1 equal to WLE specificity in NBI. 3 studies have compared PPV and NPV between NBI and WLE. Among them, all the studies found higher PPV and NPV in NBI than WLE. Conclusion: Recently?developed narrow band imaging has a great significance in the diagnosis of nasopharyngeal carcinoma. Although NBI has also encountered some problem such as contact bleeding and darker image. So, further evaluation should be done.展开更多
目的旨在确定内镜下白光成像(white lighting imaging,WLI)和窄带成像(narrow band imaging,NBI)对声带白斑(vocal cord leukoplakia,VCL)病理类型进行诊断的最佳截断点,以提高非侵入性预测VCL病理性质的准确性,并为VCL患者是否需要手...目的旨在确定内镜下白光成像(white lighting imaging,WLI)和窄带成像(narrow band imaging,NBI)对声带白斑(vocal cord leukoplakia,VCL)病理类型进行诊断的最佳截断点,以提高非侵入性预测VCL病理性质的准确性,并为VCL患者是否需要手术干预及手术时机提供参考依据。方法纳入96例确诊病理性质为VCL患者。术前分别进行WLI模式及NBI模式下的图像采集,并对病变进行WLI模式Chen分型和NBI模式Ni分型的评定。通过比较受试者操作特征曲线的约登指数得出分型的最佳截断值。通过比较2种临床分型的曲线下面积(area under the curve,AUC)、最佳截断值下的准确度、敏感度、特异性、阳性预测值及阴性预测值评价不同临床分型对VCL病理性质的诊断效能。结果WLI模式Chen分型、NBI模式Ni分型与病理等级间均存在相关性(rs=0.513、0.653,P<0.001)。WLI模式Chen分型的最佳截断值为3,即光滑平坦型及光滑隆起型为良性病变,粗糙型为恶性病变;NBI模式Ni分型的最佳截断值为5,即Ⅰ~Ⅳ型为良性病变,Ⅴ型、Ⅵ型为恶性病变。WLI模式Chen分型、NBI模式Ni分型的AUC分别为0.815,0.875。最佳截断值的准确度、敏感度、特异性、阳性预测值及阴性预测值Chen分型为79.51%,84.62%,75.71%,72.13%,86.89%;Ni分型为85.25%,76.92%,91.42%,86.96%,84.21%。结论NBI模式Ni分型及WLI模式Chen分型的诊断效能均较高,但NBI模式Ni分型对VCL病理性质的诊断效能高于白光模式Chen分型。展开更多
文摘In this paper, we report on the first observation of blue-light emission bands from europium-doped tantalum pentoxide (Ta2O5:Eu) thin films prepared using a simple co-sputtering method. We prepared four specimens from one as-deposited sample, and we subsequently annealed them at 700°C, 800°C, 900°C, or 1000°C for 20 min. Four remarkable photoluminescence (PL) peaks at wavelengths of 600, 620, 650, and 700 nm due to the 5D0→7F1, 5D0→7F2, 5D0→7F3, and 5D0→7F4 transitions of Eu3+ were observed from all the specimens, and blue PL peaks around a wavelength of 450 nm were also observed from the specimens annealed at 800°C, 900°C, and 1000°C. The blue PL peaks seem to be originated from the 4f65d1→4f7 transition of Eu2+. Both Eu3+ and Eu2+ ions seem to exist in our Ta2O5:Eu co-sputtered thin films annealed at temperatures from 800°C to 1000°C. Such Ta2O5:Eu co-sputtered thin films seem to be used as multi-functional coating films having both anti-reflection and down-conversion effects for realizing high-efficiency silicon solar cells.
文摘We prepared thulium-doped tantalum (V) oxide (Ta2O5:Tm) thin films using co-sputtering of two Tm2O3 pellets and a Ta2O5 disc, and we observed photoluminescence (PL) peaks not only around a wavelength of 800 nm due to the 3H4→3H6 transition of Tm3+ but also around a wavelength of 400 nm (violet) from the films after annealing for the first time. Comparatively narrow PL peaks around the wavelength of 400 nm were observed from the films annealed at 800°C and 900°C for 20 min. The peak intensity from the film annealed at 900°C was approximately four-times stronger than that from the film annealed at 800°C. The origin of the 400-nm peaks seems to be the same as our non-doped Ta2O5 thin films deposited using radio-frequency sputtering because we observe PL peaks around 400 - 430 nm from the Ta2O5 films. Such a Ta2O5:Tm co-sputtered thin film seems to be used as a multi-functional coating film having both anti-reflection and down-conversion effects for realizing a high-efficiency silicon solar cell.
文摘Background: Narrow band imaging (NBI) is reported to improve the diagnostic importance of nasopharyngeal cancer. The purpose of this review was to evaluate the diagnostic significance of NBI in the literature and compare it to the conventional white light endoscopy. The use of narrow band imaging (NBI) and further technological achievements concerning the resolution and magnification of endoscopic images have in the past 15 years. With the use of NBI, superficial mucosal lesions, which may be missed by standard WLI endoscopy, can be identified easily by their neoangiogenic pattern. Objective:?To assess diagnostic value of the narrow band imaging and white light endoscopy in nasopharyngeal carcinoma and compare diagnostic values (sensitivity, specificity, positive predictive value and negative predictive value) with white light endoscopy. Search Methods: From 2010 to 2020, data was searched from electronic databases such as PubMed, web of science. We used narrow band imaging as a key word accordance with diagnostic modalities such as sensitivity, specificity, PPV and NPV and data were collected. Results: We have found mainly 6 studies have discussed about diagnostic value of endoscopy in nasopharyngeal carcinoma in the total of 2746 suspected patients. Among them, 5 studies have compared diagnostic values such as sensitivity, specificity, positive predictive value and negative predictive value between NBI and WLE. Among 5 studies, 4 studies have found higher sensitivity in NBI, 2 studies found higher 1 equal to WLE specificity in NBI. 3 studies have compared PPV and NPV between NBI and WLE. Among them, all the studies found higher PPV and NPV in NBI than WLE. Conclusion: Recently?developed narrow band imaging has a great significance in the diagnosis of nasopharyngeal carcinoma. Although NBI has also encountered some problem such as contact bleeding and darker image. So, further evaluation should be done.
文摘目的旨在确定内镜下白光成像(white lighting imaging,WLI)和窄带成像(narrow band imaging,NBI)对声带白斑(vocal cord leukoplakia,VCL)病理类型进行诊断的最佳截断点,以提高非侵入性预测VCL病理性质的准确性,并为VCL患者是否需要手术干预及手术时机提供参考依据。方法纳入96例确诊病理性质为VCL患者。术前分别进行WLI模式及NBI模式下的图像采集,并对病变进行WLI模式Chen分型和NBI模式Ni分型的评定。通过比较受试者操作特征曲线的约登指数得出分型的最佳截断值。通过比较2种临床分型的曲线下面积(area under the curve,AUC)、最佳截断值下的准确度、敏感度、特异性、阳性预测值及阴性预测值评价不同临床分型对VCL病理性质的诊断效能。结果WLI模式Chen分型、NBI模式Ni分型与病理等级间均存在相关性(rs=0.513、0.653,P<0.001)。WLI模式Chen分型的最佳截断值为3,即光滑平坦型及光滑隆起型为良性病变,粗糙型为恶性病变;NBI模式Ni分型的最佳截断值为5,即Ⅰ~Ⅳ型为良性病变,Ⅴ型、Ⅵ型为恶性病变。WLI模式Chen分型、NBI模式Ni分型的AUC分别为0.815,0.875。最佳截断值的准确度、敏感度、特异性、阳性预测值及阴性预测值Chen分型为79.51%,84.62%,75.71%,72.13%,86.89%;Ni分型为85.25%,76.92%,91.42%,86.96%,84.21%。结论NBI模式Ni分型及WLI模式Chen分型的诊断效能均较高,但NBI模式Ni分型对VCL病理性质的诊断效能高于白光模式Chen分型。
