scholarly journals A LUMINESCENCE PROPERTIES OF Tb, Sm CO-DOPED IN ALKALI ALUMINOBORATE GLASSES

2019 ◽  
Vol 35 (1) ◽  
Author(s):  
Ngoc Tran
Keyword(s):  
Emission Intensity ◽  
Spectroscopic Properties ◽  
Concentration Quenching ◽  
Quenching Mechanism ◽  
Light Emitting ◽  
Quenching Effect ◽  
White Light Emitting Diodes ◽  
Concentration Quenching Effect ◽  
Co Doped ◽  
Color Emission

 Spectroscopic properties of Tb3+ and Sm3+ ions co-doped in alkali aluminoborate glasses (70-x-y)B2O3.28Li2O.2Al2O3.xSm2O3.yTb2O3 (ABL:Tb,Sm) fabricated by melting method have been studied. The emission intensity of Tb3+ or Sm3+ in ABL:Tb or ABL:Sm glasses is influenced by the Tb3+ or Sm3+ doping content, and the optimum concentrations of Tb3+ and Sm3+ are 0.75 mol% and 1.0 mol%, respectively. The concentration quenching effect of Tb3+ or Sm3+ in ABL:Tb,Sm glasses occurs, and the concentration quenching mechanism is f-f interaction for either Tb3+/Sm3+. The ABL:Tb,Sm glasses can produce color emission from green to red by properly tuning the relative ratio between Tb3+ and Sm3+, the emission intensity of Tb3+/Sm3+ in ABL:Tb,Sm glasses can be enhanced by the energy transfer from Tb3+/Tb3+ and Sm3+/Sm3+. The results indicate that ABL:Tb,Sm may be a promising double emission for white light emitting diodes.

Luminescence Properties of a Novel Blue-Emitting Phosphor NaBaBO3:Tm3+,K+

2015 ◽  
Vol 833 ◽  
pp. 39-43 ◽  
Author(s):  
Jiang Hui Zheng ◽  
Qi Jin Cheng ◽  
Li Li Ying ◽  
Li Han Cai ◽  
Chao Chen
Keyword(s):  
Dipole Interaction ◽  
Solid State Reaction Method ◽  
Concentration Quenching ◽  
Luminescence Properties ◽  
Photoluminescence Intensity ◽  
Quenching Mechanism ◽  
Light Emitting ◽  
Near Ultraviolet ◽  
Chromaticity Coordinate ◽  
White Light Emitting Diodes

A novel blue-emitting phosphor NaBaBO3doped with Tm3+was prepared using a conventional high temperature solid-state reaction method. Its crystal structure and luminescence properties were studied. Photoluminescence measurements indicate that the phosphor features a satisfactory blue performance due to the1D2→3F4transition of Tm3+with the highest photoluminescence intensity located at 460 nm excited by 359 nm near-ultraviolet (NUV) light. In addition, the concentration of Tm3+was adjusted in order to obtain the optimum emission intensity. When the Tm3+concentration in NaBaBO3is 6.0 mol% the maximum intensity can be obtained. The concentration quenching occurs when Tm3+concentration is beyond 6.0 mol% and the concentration quenching mechanism can be explained by the dipole–dipole interaction. The measured chromaticity coordinate for the NaBaBO3:Tm3+phosphor under 359 nm excitation is determined to be (0.1470, 0.1090). The present work suggests that the NaBaBO3:Tm3+,K+phosphor is a promising blue-emitting material for NUV white light-emitting diodes.

Preparation and Investigation of Tm3+- Doped Li3Gd3Te2O12 Blue-Emitting Phosphor

2018 ◽  
Vol 921 ◽  
pp. 111-118 ◽  
Author(s):  
Bin Deng ◽  
Chong Song Zhou ◽  
Hui Liu ◽  
Jun Chen
Keyword(s):  
Solid State ◽  
Emission Spectra ◽  
Critical Distance ◽  
Concentration Quenching ◽  
Color Purity ◽  
Doping Content ◽  
Quenching Mechanism ◽  
Light Emitting ◽  
Blue Phosphor ◽  
White Light Emitting Diodes

A novel blue-emitting phosphor, Li3Gd3Te2O12:Tm3+ for white light-emitting diodes (W-LEDs) was prepared by solid-state synthesis and its structure and luminescence properties were investigated. This phosphor shows a satisfactory blue performance (peak at 458 nm) due to the 1D2 → 3F4 transition of Tm3+ excited by 361 nm light. Investigation of Tm3+ content dependent emission spectra indicates that x = 0.03 is the optimum doping content of Tm3+ ions in the Li3Gd3Te2O12 host. The critical distance and the concentration quenching mechanism were also investigated. In particular, the color purity of as-prepared sample is close to that of the commercial blue phosphor BaMgAl10O17:Eu2+ (BAM:Eu2+). The present work suggests that the Li3Gd3Te2O12:Tm3+ phosphor is a potential blue-emitting candidate for the application in the near-UV WLEDs.

Modeling of thermoluminescence in SrY2O4:Eu3+and their concentration quenching effect

Optik ◽  
2021 ◽  
Vol 232 ◽  
pp. 166607
Author(s):  
Amirouche Bouremani ◽  
Dahane Kadri ◽  
Ahmed Kadari ◽  
Vikas Dubey
Keyword(s):  
Concentration Quenching ◽  
Quenching Effect ◽  
Concentration Quenching Effect

Spectroscopic properties of Dy3+-doped oxyfluoride glasses for white light emitting diodes

2013 ◽  
Vol 3 (1) ◽  
pp. 61-70 ◽  
Author(s):  
Kummara Venkata Krishnaiah ◽  
Kagola Upendra Kumar ◽  
Chalicheemalapalli Kulala Jayasankar
Keyword(s):  
White Light ◽  
Light Emitting Diodes ◽  
Spectroscopic Properties ◽  
Light Emitting ◽  
Oxyfluoride Glasses ◽  
White Light Emitting Diodes

Ester-functionalized thermally activated delayed fluorescence materials

2021 ◽  
Author(s):  
Hiroshi Tasaki ◽  
So Shikita ◽  
In Seob Park ◽  
Takuma Yasuda
Keyword(s):  
Delayed Fluorescence ◽  
Concentration Quenching ◽  
Thermally Activated Delayed Fluorescence ◽  
Quenching Effect ◽  
Thermally Activated ◽  
Concentration Quenching Effect ◽  
Neat Films

A family of thermally activated delayed fluorescence (TADF) materials functionalized with carboxylate esters is presented herein. Owing to their suppressed concentration-quenching effect in neat films, these ester-functionalized TADF emitters could...

The Morphologies and Photoluminescence of Ce3+-Doped 0.5La2O3-2SrO-0.5Al2O3 Phosphors with SrF2

2016 ◽  
Vol 680 ◽  
pp. 228-232
Author(s):  
Xi Guang Gu ◽  
Ren Li Fu ◽  
Ye Tang ◽  
Fang Yang
Keyword(s):  
Solid State ◽  
White Light ◽  
Solid State Reaction ◽  
Emission Intensity ◽  
Solid State Reaction Method ◽  
Conventional Solid State Reaction ◽  
Light Emitting ◽  
Reaction Method ◽  
Reducing Atmosphere ◽  
White Light Emitting Diodes

Ce3+-doped 0.5La2O3-2SrO-0.5Al2O3 (LSA:Ce) phosphors had been successfully synthesized using a conventional solid-state reaction method under reducing atmosphere (H2/N2 =1/5). The phase, morphologies and luminescence properties of the LSA:Ce phosphors were investigated. The emission intensity of LSA:Ce phosphors was improved by the addition of SrF2 as flux, and red shift of PL spectra peak was observed in this phosphors. Research results shown that the LSA:Ce phosphors have the potential to meet the development of white light-emitting diodes.

Sign in / Sign up

Export Citation Format

Share Document