Eu³⁺ doped lutetium molybdenum oxides: Synthesis, optical properties, thermal behavior, and LED packaging

Cao, Chunyan,Xie, Along,Zhou, Tianliang,Zhong, Haichang,Lu, Xiangjun,Xie, An,Noh, Hyeon Mi,Jeong, Jung Hyun Elsevier 2020 Journal of luminescence Vol.217 No.-

<P><B>Abstract</B></P> <P>Some lutetium molybdenum oxides were synthesized through a solid-state reaction method. By adjusting the molar ratios of raw materials of Lu<SUB>2</SUB>O<SUB>3</SUB> (Eu<SUB>2</SUB>O<SUB>3</SUB>) to MoO<SUB>3</SUB>, Eu<SUP>3+</SUP> doped lutetium molybdenum oxides Lu<SUB>2</SUB>MoO<SUB>6</SUB>, Lu<SUB>2</SUB>Mo<SUB>2</SUB>O<SUB>9</SUB>, Lu<SUB>2</SUB>(MoO<SUB>4</SUB>)<SUB>3</SUB>, and Lu<SUB>6</SUB>MoO<SUB>12</SUB> were obtained. The materials were characterized by X-ray diffraction (XRD) patterns, scanning electron microscope (SEM) images, energy-dispersive spectra (EDS), diffuse reflection (DR) spectra, photoluminescence (PL) excitation and emission spectra, luminescence decay curves, and temperature dependent integrated emission spectra. Enhanced excitation and emission spectra were recorded at high temperatures. Possible energy transfer processes were proposed to explain the excitation and emission spectra. By combining some phosphors with near ultraviolet (NUV) chips, the obtained light emitting diodes (LEDs) gave red light under forward bias current. The results suggest that the obtained Eu<SUP>3+</SUP> doped lutetium molybdenum oxides have potential applications in phosphor converted based NUV LEDs.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Eu<SUP>3+</SUP> doped Lu<SUB>2</SUB>MoO<SUB>6</SUB>, Lu<SUB>2</SUB>Mo<SUB>2</SUB>O<SUB>9</SUB>, Lu<SUB>2</SUB>(MoO<SUB>4</SUB>)<SUB>3</SUB>, and Lu<SUB>6</SUB>MoO<SUB>12</SUB> were obtained. </LI> <LI> The materials present different structures, morphologies, optical properties, and luminescece decay behaviors. </LI> <LI> Eu<SUP>3+</SUP> concentration dependent optical properties in Lu<SUB>2</SUB>MoO<SUB>6</SUB> were researched. </LI> <LI> Enhanced excitation and emission spectra were recorded under high temperatures in some materials. </LI> <LI> Red LEDs were obtained by packaging phosphors to NUV LED chips. </LI> </UL> </P>

Synthesis, properties, and package of Eu²⁺ doped green-yellow Ba(Ca)SiO(N) phosphors in NUV LED

Cao, Chunyan,Zhou, Tianliang,Zhong, Haichang,Xie, An,Noh, Hyeon Mi,Jeong, Jung Hyun Elsevier 2019 SOLID STATE SCIENCES Vol.94 No.-

<P><B>Abstract</B></P> <P>In the study, a two-step high temperature solid state reaction method was applied to synthesize the green and green-yellow phosphors of 0.5 mol% Eu<SUP>2+</SUP> doped Ba<SUB>2</SUB>SiO<SUB>4</SUB>, mixture of Ba<SUB>3</SUB>Si<SUB>6</SUB>O<SUB>9</SUB>N<SUB>4</SUB> and Ba<SUB>2</SUB>SiO<SUB>4</SUB>, CaSi<SUB>2</SUB>O<SUB>2</SUB>N<SUB>2</SUB>. X-ray diffraction (XRD), scanning electron microscope (SEM), diffuse reflection (DR) spectra, photoluminescence (PL) excitation and emission spectra, thermal stability behavior, and luminescent decay curves were employed to analyze these phosphors. In the first step reaction, Eu<SUP>3+</SUP> present weak red or orange-red emission. After reduction from Eu<SUP>3+</SUP> to Eu<SUP>2+</SUP> in the N<SUB>2</SUB>(95%)–H<SUB>2</SUB>(5%) atmosphere in the second reaction step, the Eu<SUP>2+</SUP> presented bright green or green-yellow light under near ultraviolet (NUV) excitation. By combining the phosphors with NUV chips, the obtained LEDs gave bright light under forward bias current. The obtained green and green yellow materials can be used in phosphor converted based LEDs.</P> <P><B>Highlights</B></P> <P> <UL> <LI> A two-step high temperature solid state reaction method was applied. </LI> <LI> Eu<SUP>2+</SUP> doped Ba<SUB>2</SUB>SiO<SUB>4</SUB>, Ba<SUB>3</SUB>Si<SUB>6</SUB>O<SUB>9</SUB>N<SUB>4</SUB>, CaSi<SUB>2</SUB>O<SUB>2</SUB>N<SUB>2</SUB> were obtained. </LI> <LI> Eu<SUP>2+</SUP> was obtained by reduction of Eu<SUP>3+</SUP> in the N<SUB>2</SUB>(95%)–H<SUB>2</SUB>(5%) atmosphere. </LI> <LI> Eu<SUP>2+</SUP> gave green or green-yellow light under near ultraviolet excitation. </LI> <LI> Green and green-yellow LEDs were obtained by packaging phosphors to NUV LED chips. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>PL excitation and emission spectra of materials synthesized at 1350 °C.</P> <P>[DISPLAY OMISSION]</P>

Synthesis and up-conversion emissions of $$\hbox {Yb}^{3+}{/}\hbox {Er}^{3+}$$ Yb 3 + / Er 3 + , $$\hbox {Yb}^{3+}{/}\hbox {Tm}^{3+}$$ Yb 3 + / Tm 3 + and $$\hbox {Yb}^{3+}{/}\hbox {Tm}^{3+}{/}\hbox {Gd}^{3+}$$ Yb 3 + / Tm 3 + / Gd 3 + co-doped $$\hbox {

Cao, Chunyan,Xie, An,Noh, Hyeon Mi,Jeong, Jung Hyun Springer-Verlag 2017 Bulletin of materials science Vol.40 No.6

Electroconvulsive Therapy on Severe Obsessive-Compulsive Disorder Comorbid Depressive Symptoms

Xiaohui Liu,Xinhui Xie,Hong Cui,Qiang Wei,Ying Wang,Keyong Wang,Chen Wang,Chunyan Zhu 대한신경정신의학회 2014 PSYCHIATRY INVESTIGATION Vol.11 No.2

Electroconvulsive therapy (ECT) is not currently used as a first-line treatment for obsessive-compulsive disorder (OCD). However, several related case reports have demonstrated that ECT seems to be effective for severe OCD, especially when first-line therapies have failed. In this study, we describe the courses, detailed parameters, effects, and follow-up information relating to three patients with severe OCD who were treated by modified bifrontal ECT after their first-line anti-OCD treatments pharmacotherapy, behavioral therapy, and cognitive behavioral therapy failed. The number of ECT procedures administered in each case is as follows: Case 1, eight; Case 2, three; and Case 3, four. In all three cases, the patients’ depressive symptoms improved considerably after the ECT procedures. In addition, the condition of all three patients’ OCD significantly improved and remained stable at regular follow-ups. ECT may play an effective role in treating severe OCD.

Electroconvulsive Therapy on Severe Obsessive-Compulsive Disorder Comorbid Depressive Symptoms

Xiaohui Liu,Hong Cui,Qiang Wei,Ying Wang,Keyong Wang,Chen Wang,Chunyan Zhu,Xinhui Xie 대한신경정신의학회 2004 PSYCHIATRY INVESTIGATION Vol.1 No.2

Electroconvulsive therapy (ECT) is not currently used as a first-line treatment for obsessive-compulsive disorder (OCD). However, several related case reports have demonstrated that ECT seems to be effective for severe OCD, especially when first-line therapies have failed. In this study, we describe the courses, detailed parameters, effects, and follow-up information relating to three patients with severe OCD who were treated by modified bifrontal ECT after their first-line anti-OCD treatments pharmacotherapy, behavioral therapy, and cognitive behavioral therapy failed. The number of ECT procedures administered in each case is as follows: Case 1, eight; Case 2, three; and Case 3, four. In all three cases, the patients’ depressive symptoms improved considerably after the ECT procedures. In addition, the condition of all three patients’ OCD significantly improved and remained stable at regular follow-ups. ECT may play an effective role in treating severe OCD.

Preparation of Monascus-fermented ginkgo seeds: optimization of fermentation parameters and evaluation of bioactivity

Wu Zhihao,Miao Wen,Yang Yuhan,Fan Gongjian,Wu Caie,Li Tingting,Xie Chunyan,Shen Dongbei 한국식품과학회 2022 Food Science and Biotechnology Vol.31 No.6

In this study, a high monacolin K yield was achieved through solid-state fermentation of Ginkgo biloba seeds. Monascus purpureus suspension made from red yeast rice was used as spore inoculum. Fermentation conditions in solid-state fermentation were optimized using response surface methodology, and the optimal conditions for the maximum monacolin K yield (17.71 ± 1.57 mg/g) were 0.22% ammonium sulfate, 0.34% ammonium chloride, 0.05% magnesium sulfate, fermentation time of 12 days, inoculation volume of 11%, and temperature of 27 °C. The total phenolic content of Monascus-fermented ginkgo seeds attained 9.67 mg GAE/g, 4.88-fold higher than that of unfermented ginkgo seeds. The scavenging abilities of DPPH and ABTS free radicals increased to 9.79 mg TE/g and 13.92 mg TE/g, respectively. These findings highlight the importance of investigating the optimal fermentation conditions for maximum monacolin K yield and the utilization value of ginkgo seed as fermentation substrate for higher bioactivities.

Primary Invasive Mucinous Adenocarcinoma of the Lung: Prognostic Value of CT Imaging Features Combined with Clinical Factors

Wang Tingting,Yang Yang,Liu Xinyue,Deng Jiajun,Wu Junqi,Hou Likun,Wu Chunyan,She Yunlang,Sun Xiwen,Xie Dong,Chen Chang 대한영상의학회 2021 Korean Journal of Radiology Vol.22 No.4

Objective: To investigate the association between CT imaging features and survival outcomes in patients with primary invasive mucinous adenocarcinoma (IMA). Materials and Methods: Preoperative CT image findings were consecutively evaluated in 317 patients with resected IMA from January 2011 to December 2015. The association between CT features and long-term survival were assessed by univariate analysis. The independent prognostic factors were identified by the multivariate Cox regression analyses. The survival comparison of IMA patients was investigated using the Kaplan-Meier method and propensity scores. Furthermore, the prognostic impact of CT features was assessed based on different imaging subtypes, and the results were adjusted using the Bonferroni method. Results: The median follow-up time was 52.8 months; the 5-year disease-free survival (DFS) and overall survival rates of resected IMAs were 68.5% and 77.6%, respectively. The univariate analyses of all IMA patients demonstrated that 15 CT imaging features, in addition to the clinicopathologic characteristics, significantly correlated with the recurrence or death of IMA patients. The multivariable analysis revealed that five of them, including imaging subtype (p = 0.002), spiculation (p < 0.001), tumor density (p = 0.008), air bronchogram (p < 0.001), emphysema (p < 0.001), and location (p = 0.029) were independent prognostic factors. The subgroup analysis demonstrated that pneumonic-type IMA had a significantly worse prognosis than solitary-type IMA. Moreover, for solitary-type IMAs, the most independent CT imaging biomarkers were air bronchogram and emphysema with an adjusted p value less than 0.05; for pneumonic-type IMA, the tumors with mixed consolidation and ground-glass opacity were associated with a longer DFS (adjusted p = 0.012). Conclusion: CT imaging features characteristic of IMA may provide prognostic information and individual risk assessment in addition to the recognized clinical predictors.