Eu³⁺, Sm³⁺ Deep‐Red Phosphors as Novel Materials for White Light‐Emitting Diodes and Simultaneous Performance Enhancement of Organic–Inorganic Perovskite Solar Cells

Abstract

The luminous efficiency of inorganic white light‐emitting diodes, to be used by the next generation as light initiators, is continuously progressing and is an emerging interest for researchers. However, low color‐rendering index (Ra), high correlated color temperature (CCT), and poor stability limit its wider application. Herein, it is reported that Sm3+‐ and Eu3+‐doped calcium scandate (CaSc2O4 (CSO)) are an emerging deep‐red‐emitting material with promising light absorption, enhanced emission properties, and excellent thermal stability that make it a promising candidate with potential applications in emission display, solid‐state white lighting, and the device performance of perovskite solar cells (PSCs). The average crystal structures of Sm3+‐doped CSO are studied by synchrotron X‐ray data that correspond to an extremely rigid host structure. Samarium ion is incorporated as a sensitizer that enhances the emission intensity up to 30%, with a high color purity of 88.9% with a 6% increment. The impacts of hosting the sensitizer are studied by quantifying the lifetime curves. The CaSc2O4:0.15Eu3+,0.03Sm3+ phosphor offers significant resistance to thermal quenching. The incorporation of lanthanide ion‐doped phosphors CSOE into PSCs is investigated along with their potential applications. The CSOE‐coated PSCs devices exhibit a high current density and a high power conversion efficiency (15.96%) when compared to the uncoated control devices.

Research Progress on the Application of Lanthanide-Ion-Doped Phosphor Materials in Perovskite Solar Cells

“…Hence, it is considered as a suitable candidate for enhancing the device performances of PVSCs and is depicted in Figure 7d−g. 79 In this study, the emission spectrum changed its shape (width and intensity) with respect to a change of the doping concentration of Eu 3+ in codoped phosphors. Moreover, the incorporation of lanthanide-ion-doped CSO phosphors in PVSCs exhibited higher J SC (21.6 mA cm −2 ) and PCE (15.96%) values with reduced UV-light-induced photodegradation when compared to control devices.…”

Red-Emitting Phosphor Ca2MgSi2O7: Sm3+, Eu3+ for UV White Light-Emitting Diodes

“…It presents a low CCT (~5553 K ) and high R a (~84.8), which is superior to those of the commercial white LED composed of blue chip and YAG: Ce 3+ phosphor (CCT~7756 K ; R a~7 5) .The CIE chromaticity coordinates are calculated as (0.3313, 0.3358). The properties of the white LEDs packaged in this work indicate that the red phosphor Ca 2 MgSi 2 O 7 : 2% Sm 3+ , 7% Eu 3+ can be used very effectively as a phosphor in UV-white LED lighting devices 26 . Fig.…”

Modulating the optical and electrical properties of oxygen vacancy-enriched La2Ce2O7:Sm3+ pyrochlore: role of dopant local structure and concentration

“…The Sm 3+ ion is an ideal luminescent dopant for red/orange emitting phosphors when incorporated inside a suitable host matrix and has been applied in a wide gamut of technological applications such as solid-state lighting, light-emitting diodes, thermal sensors, solar cells, lasers, and cancer tracking. 7–13 In most of the Sm 3+ -doped phosphors, PL is triggered mainly by HSET because of the low oscillator and narrow width of the Sm 3+ 4f–4f absorption band leading to very feeble absorption in the 300–380 nm UV region. 14–16 In most such materials, HSET is dictated by host and dopant energy level matching.…”