Optimized photoluminescence quantum yield in upconversion composites considering the scattering, inner-filter effects, thickness, self-absorption, and temperature.
Optimized photoluminescence quantum yield in upconversion composites considering the scattering, inner-filter effects, thickness, self-absorption, and temperature.
复制标题
DOI：
10.1038/s41598-021-93400-8
复制
发表时间：
2021-07-06
影响因子：
4.6
通讯作者：
Marques-Hueso J
中科院分区：
文献类型：
--
作者：
Jones CMS;Biner D;Misopoulos S;Krämer KW;Marques-Hueso J
优化上转换(UC)复合材料是一项具有挑战性的工作，因为众多影响因素会影响其独特的发射机制。低散射介质增加了掺杂激发的数量，而高散射介质由于其非线性的功率依赖性而增加了UC的效率。在较低的激发功率密度(PD)下，散射也会导致更大的热效应和发射饱和。在本工作中，与折射率匹配的介质相比，空气中掺入18%Yb3+，2%Er3+的六方NaYF4荧光粉的光致发光量子产率(PLQY)提高了270%。此外，当激发焦点从荧光粉的正面移至8.4 mm深时，初级内滤光片效应使PLQY减小94%。增加这一效应限制了最大激励Pd，减少了热效应，并导致在较高激励Pd时发射饱和。此外，当荧光粉的厚度从1 mm增加到9 mm时，自吸收会降低PLQY。最后，与长方体试管相比，由于曲面玻璃的透镜效应，当表征圆柱形试管中的荧光粉时，PLQY增加了27%，这一点得到了模拟的支持。总体而言，解决这项工作中呈现的影响对于最大化UC综合性能以及更可靠地报告其PLQY是必要的。
Optimizing upconversion (UC) composites is challenging as numerous effects influence their unique emission mechanism. Low scattering mediums increase the number of dopants excited, however, high scattering mediums increase the UC efficiency due to its non-linear power dependency. Scattering also leads to greater thermal effects and emission saturation at lower excitation power density (PD). In this work, a photoluminescence quantum yield (PLQY) increase of 270% was observed when hexagonal NaYF4:(18%)Yb3+,(2%)Er3+ phosphor is in air compared to a refractive index-matched medium. Furthermore, the primary inner-filter effect causes a 94% PLQY decrease when the excitation focal point is moved from the front of the phosphor to 8.4 mm deep. Increasing this effect limits the maximum excitation PD, reduces thermal effects, and leads to emission saturation at higher excitation PDs. Additionally, self-absorption decreases the PLQY as the phosphor’s thickness increases from 1 to 9 mm. Finally, in comparison to a cuboid cuvette, a 27% PLQY increase occurs when characterizing the phosphor in a cylindrical cuvette due to a lensing effect of the curved glass, as supported by simulations. Overall, addressing the effects presented in this work is necessary to both maximize UC composite performance as well as report their PLQY more reliably.
登录
查看更多内容
影响因子：
3.7
作者：
Fonin AV;Sulatskaya AI;Kuznetsova IM;Turoverov KK
通讯作者：
Turoverov KK
影响因子：
3.6
作者：
Fischer, Stefan;Martin-Rodriguez, Rosa;Goldschmidt, Jan Christoph
通讯作者：
Goldschmidt, Jan Christoph
影响因子：
3.8
作者：
MacDougall, Sean K. W.;Aruna, Ivaturi;Richards, Bryce S.
通讯作者：
Richards, Bryce S.
影响因子：
6.7
作者：
Skripka, Artiom;Cheng, Ting;Vetrone, Fiorenzo
通讯作者：
Vetrone, Fiorenzo
影响因子：
16.6
作者：
Homann, Christian;Krukewitt, Lisa;Haase, Markus
通讯作者：
Haase, Markus