Some spoken and sung prayers mentioning the Trinity have a wide pedigree, East as well as West:
159. Together with the little doxology (Glory be to the Father, and to the Son, and to the Holy Spirit….) and the great doxology (Glory be to God in the highest), pious exercises addressed directly to the Most Blessed Trinity often include formulas such as the biblical Trisagion (Holy, Holy, Holy) and also its liturgical form (Holy God, Holy Strong One, Holy Immortal One, have mercy on us), especially in the Eastern Churches, in some Western countries as well as among numerous religious orders and congregations.
The expression of praise is rooted in the Advent prophet as well as the last book of the New Testament:
The liturgical Trisagion is inspired by liturgical hymns and its biblical counterpart. Here mention could be made of the Sanctus used in the celebration of the Mass, the Te Deum, the improperia of Good Friday’s veneration of the Cross, all of which are derived from Isaiah 6, 3 and (Revelation) 4, 8. The Trisagion is a pious exercise in which the faithful, united with the Angels, continually glorify God, the Holy, Powerful and Immortal One, while using expressions of praise drawn from Scripture and the Liturgy.
The Directory on Popular Piety and the Liturgy is online at the Vatican site.
Catholic Sensibility 