Beam-profile-compensated quantum yield measurements of upconverting nanoparticles

2017 ◽  
Vol 19 (33) ◽  
pp. 22016-22022 ◽  
Author(s):  
Monirehalsadat Mousavi ◽  
Björn Thomasson ◽  
Meng Li ◽  
Marco Kraft ◽  
Christian Würth ◽  
...  
Keyword(s):  
Quantum Yield ◽  
Power Density ◽  
Excitation Power ◽  
Beam Profile ◽  
Excitation Power Density ◽  
Luminescence Signal

The UCNP luminescence signal depends non-linearly on the excitation power density, making beam profiling essential in quantum yield measurements. The 2D Gaussian and its squared profile illustrates this concept.

Relation between Excitation Power Density and Er3+ Doping Yielding the Highest Absolute Upconversion Quantum Yield

2014 ◽  
Vol 118 (51) ◽  
pp. 30106-30114 ◽  
Author(s):  
Stefan Fischer ◽  
Benjamin Fröhlich ◽  
Karl W. Krämer ◽  
Jan Christoph Goldschmidt
Keyword(s):  
Quantum Yield ◽  
Power Density ◽  
Excitation Power ◽  
Excitation Power Density

Low-Power Triplet-Triplet Annihilation Upconversion with a New Anthracene Derivatives

2016 ◽  
Vol 852 ◽  
pp. 1265-1270
Author(s):  
Sai Jiang Zhu ◽  
Chang Qing Ye ◽  
Yan Fu ◽  
Zuo Qing Liang ◽  
Xiao Mei Wang
Keyword(s):  
Quantum Yield ◽  
Low Power ◽  
Power Density ◽  
High Efficiency ◽  
Excitation Power ◽  
Quantum Yields ◽  
Excitation Power Density ◽  
High Quantum ◽  
Anthracene Derivatives ◽  
Triplet Triplet Annihilation

Two new anthracene derivatives were synthesized as emitter for low power triplet-triplet annihilation upconversion. Compared with anthracene, the emitter exhibits high quantum yields up to 85%. Pd (II) tetraphenylporphyrin which was selected as the sensitizer with the existence of BBA in DMF, We find a pretty high efficiency (Φuc=21.9%) of the upconversion fluorescence at 532nm with a low excitation power density of 0.5w/cm2.With the comparison of Anthracene, BBA and BTPA systems, quantum yield of the emitter is very important to the improving of the efficiency of upconversion.

The sensitization of laser-induced heat of Er3+ doped Y2O3 nanocrystals by codoped with Mn2+

2015 ◽  
Vol 29 (22) ◽  
pp. 1550158
Author(s):  
Yunfeng Bai ◽  
Minjie Luan ◽  
Linjun Li ◽  
Zhelong He ◽  
Dongyu Li
Keyword(s):  
Power Density ◽  
Thermal Emission ◽  
Energy Levels ◽  
Excitation Power ◽  
Threshold Power ◽  
Excitation Power Density ◽  
Ir Laser ◽  
Order Of Magnitude ◽  
Low Threshold ◽  
Density Threshold

Low threshold power density cw laser-induced heat has been observed in [Formula: see text] and [Formula: see text] codoped [Formula: see text] nanocrystals under excitation by a 980 nm IR laser. Codoped [Formula: see text] remarkably reduces the power density threshold of laser-induced heat compared with [Formula: see text] doped [Formula: see text] nanocrystals. When the excitation power density exceed [Formula: see text], [Formula: see text] codoped [Formula: see text] nanocrystals emit strong blackbody radiation. The thermal emission of [Formula: see text] should originate from the multiphonon relaxation between neighboring energy levels. One additional UC-PL enhancement is observed. The UC-PL intensity can be enhanced by an order of magnitude through high temperature calcination caused by light into heat.

Excitation-Power-Density Dependent ac Surface Photovoltages in Radiation-Damaged Si Wafer

1984 ◽  
Vol 23 (Part 1, No. 6) ◽  
pp. 778-779 ◽  
Author(s):  
Chusuke Munakata ◽  
Noriaki Honma ◽  
Hajime Hayakawa
Keyword(s):  
Power Density ◽  
Excitation Power ◽  
Excitation Power Density ◽  
Density Dependent ◽  
Si Wafer

Effect of excitation power density on the upconversion luminescence of LaF3:Yb3+, Er3+ nanocrystals

2009 ◽  
Vol 485 (1-2) ◽  
pp. 493-496 ◽  
Author(s):  
Yuqiu Qu ◽  
Xianggui Kong ◽  
Yajuan Sun ◽  
Qinghui Zeng ◽  
Hong Zhang
Keyword(s):  
Power Density ◽  
Upconversion Luminescence ◽  
Excitation Power ◽  
Excitation Power Density

A microfluidic-photonic-integrated device with enhanced excitation power density

2010 ◽  
Author(s):  
Benjamin R. Watts ◽  
Thomas Kowpak ◽  
Chang-Qing Xu ◽  
Shiping Zhu ◽  
Zhiyi Zhang
Keyword(s):  
Power Density ◽  
Excitation Power ◽  
Excitation Power Density ◽  
Integrated Device
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