A new persistent blue-emitting phosphor: Tailoring the trap density for enhancing the persistent time

Viswanath, Noolu Srinivasa Manikanta; Grandhi, G. Krishnamurthy; Kim, Ha Jun; Zhuang, Yixi; Xie, Rong‐Jun; Im, Won Bin

doi:10.1016/j.apmt.2019.100518

Cited by 20 publications

(16 citation statements)

References 36 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The thermal quenching (TQ) properties of the Y 2 O 3 :Er 3+ , Yb 3+ and Y 2 O 3 :Tm 3+ , Yb 3+ PiG samples were studied from room temperature to 200ºC, as shown in Figure 4A and B, respectively. Generally, the PL efficiency of the PiG samples decreases for increasing the temperature of the LED due to enhanced nonradiative transition 18‐20 . As the temperature increases, the Y 2 O 3 :Er 3+ , Yb 3+ PiG exhibits a gradually decreasing luminescence.…”

Section: Resultsmentioning

confidence: 99%

Up‐conversion phosphor plate for white lighting device using NIR excitation source

Jang

Kim

et al. 2020

J. Am. Ceram. Soc.

View full text Add to dashboard Cite

Upconversion phosphors have numerous advantages compared to down conversion phosphor materials, such as a weak background interface, low excitation energy, sharp emission lines, and long lifetimes. Conventionally, blue laser diodes are used to obtain strong white light by combining green-and red-emitting phosphors. The blue-excited white-light-emitting devices can be harmful when the blue light penetrates directly into the human body. However, lower energy excited lighting devices does not harm the human body because of their low-energy photons are compatible with the biologically safe window. Hence, we present a prototype device that converts invisible near-infrared light into visible white light. For this, we synthesized orange-emitting Y 2 O 3 :Er 3+ , Yb 3+ and blue-emitting Y 2 O 3 :Tm 3+ , Yb 3+ upconversion phosphors using a solid-state reaction. Using these, phosphor-in-glass (PiG) samples with sintered glass frit were prepared to investigate their optical behavior under lowexcitation energy. The emission color from the stacked PiGs depends on the color balance between the activator ions of Er 3+ , Tm 3+ , and Yb 3+ , and their balance is optimized to obtain a white light. The results might pave the way for designing safe white-light-emitting devices using a low-energy excitation source.

show abstract

Section: Resultsmentioning

confidence: 99%

Up‐conversion phosphor plate for white lighting device using NIR excitation source

Jang

Kim

et al. 2020

J. Am. Ceram. Soc.

View full text Add to dashboard Cite

show abstract

“…Thus, long PPs could be applied in fingerprint and security code detection. Novel blue light emitting Na 3 ScSi 3 O 9 :Ce 3+ ,Dy 3+ longlasting phosphor was synthesized by Viswanath et al [91] through the solid-state reaction method. Persistence in the blue region was observed for a period of 17 h. High persistent efficiency was obtained by co-doping with Dy 3+ .…”

Section: Persistence Phosphor In Uv Regionmentioning

confidence: 99%

Persistent phosphors for luminous paints: A review

Kalyani¹,

Jain

Dhoble

2022

Luminescence

View full text Add to dashboard Cite

The article briefly reports the fundamental scientific principles and landmarks in the field of luminescence and further enlightens the importance of persistent phosphor that is now widely used in luminous paints. Its main focus is on phosphorescence that makes use of lanthanides that have gained paramount importance in various crosssections of luminescent applications. Both inorganic and organic afterglow materials, synthesis and characterization along with skilled researchers' essential updates on emerging trends and efforts are elucidated at length. It exclusively reviews the red/green/blue organic/inorganic/hybrid phosphorescent materials and the latest advances in the development of novel long afterglow materials that can accelerate the green technology in the world of luminescence.

show abstract

“…For the generation of afterglow of trap-controlled matrixes, the energy is stored in traps and then an energy transfer process back to the emitters takes place, revealing the number of traps and trap depth plays irreplaceable roles in the determination of afterglow time and intensity. [233] Different from the former, the PersL decay of CDs is divided into RTP and TADF, which are closely related to the ISC and RISC processes, respectively. [69] Note that PersL decay of CDs is affected by bandgap, obviously.…”

Section: Inorganic Persl Materialsmentioning

confidence: 99%

Combinations of Superior Inorganic Phosphors for Level‐Tunable Information Hiding and Encoding

2021

Advanced Optical Materials

View full text Add to dashboard Cite

Inorganic photoluminescence (PL) phosphors (including upconversion (UC), down‐shifting (DS), and persistent (PersL) materials) with tunable outputs, high quantum yields (QYs), and excellent photostability have attracted tremendous attention in advanced information hiding and encoding (IHE). The three kinds of phosphors endow security patterns in different IHE levels owing to their unique optical features. For security applications, it is very necessary to review how to boost optical performance and achieve multi‐level anti‐counterfeiting. Herein, diversely pivotal approaches on the achievement of multicolor emissions, high QYs, and excellent photostability are summarized. Full learning of these methods is promising to design superior inorganic phosphors. Based on the appealing optical properties of inorganic PL materials, a progressively improved IHE level is revealed by using unitary inorganic PL material, the couples of UCL, DS, and PersL, and further combinations together with external stimuli. This review not only deepens an understanding of designing high‐performance inorganic PL phosphors, but also gets inside into the construction of high‐performance IHE.

show abstract

A new persistent blue-emitting phosphor: Tailoring the trap density for enhancing the persistent time

Cited by 20 publications

References 36 publications

Up‐conversion phosphor plate for white lighting device using NIR excitation source

Up‐conversion phosphor plate for white lighting device using NIR excitation source

Persistent phosphors for luminous paints: A review

Combinations of Superior Inorganic Phosphors for Level‐Tunable Information Hiding and Encoding

Contact Info

Product

Resources

About